As per https://www.statista.com roughly 306.4 billion emails were sent and received each day in 2020,
the figure is expected to increase to over 361.6 billion daily mails in 2024.
In 2018, approximately 281 billion e-mails were sent and received every day worldwide. This figure is projected to increase to over 347 billion daily e-mails in 2023. Recent industry data shows that the trend towards mobile also holds true for e-mail: in December 2018, 43 percent of e-mail opens were via mobile. Desktop e-mail clients’ open share had declined to 18 percent, and webmail accounted for 39 percent of opens. Based on the dominance of mobile, it is no surprise that the iPhone e-mail app was the most popular e-mail client, accounting for 29 percent of e-mail opens. Gmail was ranked second with a 27 percent open share. Gmail is a free e-mail service owned by Google, and the company reported 1.5 billion active Gmail users worldwide in October 2018.
How Information technology is changing business and day to day human life. Today World become Global Village..You can communicated and do business on click of mouse. china is the best example..How Alibaba has changed chines business and jack maa become richest business man in china. Today Knowledge of Information technlogy is not a choice its become compulsion. When a person join in company to do office work..1st thing employee get computer and then the most import identity is Email. Now introduce themself within the group email.
The mots talked email purchase happend in IT Industry
On December 31, 1997, Microsoft acquired Hotmail.com for $500 million, its largest acquisition at the time, and integrated Hotmail into its MSN group of services. Hotmail, a free webmail service founded in 1996 by Jack Smith and Sabeer Bhatia, had more than 8.5 million subscribers earlier that month.
Knowledge of email like is basically knowledge of communication. You cant survive without knowledge of Email..To
WHAT IS EMAIL
"Emails are messages sent and received electronically. Professionals use emails to communicate a variety of messages, such as scheduling meetings, requesting information from other employees, and sending marketing messages to customers.
"
Now email become our digital identity . if we want to communicate to any one we just need a valid email address
How email address is defined ...Lets under When you send letter to some one what you need
Physical address to Whom You are sending and also From Address from where you are sending
Same way Email also should have electronic address
Above Example - "john.smith" is email address
@ - Symbol of Email address
example.com is domain name
Sample of valid email address
Valid email addresses
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected] (may go to [email protected] inbox depending on mail server)
[email protected] (one-letter local-part)
[email protected]
admin@mailserver1 (local domain name with no TLD, although ICANN highly discourages dotless email addresses[10])
[email protected] (see the List of Internet top-level domains)
" "@example.org (space between the quotes)
"john..doe"@example.org (quoted double dot)
[email protected] (bangified host route used for uucp mailers)
user%[email protected] (% escaped mail route to [email protected] via example.org)
Invalid email address
Abc.example.com (no @ character)
A@b@[email protected] (only one @ is allowed outside quotation marks)
a"b(c)d,e:f;gi[j\k][email protected] (none of the special characters in this local-part are allowed outside quotation marks)
just"not"[email protected] (quoted strings must be dot separated or the only element making up the local-part)
this is"not\[email protected] (spaces, quotes, and backslashes may only exist when within quoted strings and preceded by a backslash)
this\ still"not\[email protected] (even if escaped (preceded by a backslash), spaces, quotes, and backslashes must still be contained by quotes)
1234567890123456789012345678901234567890123456789012345678901234+x@example.com (local-part is longer than 64 characters)
i_like_underscore@but_its_not_allowed_in_this_part.example.com (Underscore is not allowed in domain part)
User Error Messages
Temporary Problems are likely to be fixed soon
Mailbox is full
The most common user problem is a full mailbox. Most systems have a limit on how much email is allow to reside on the server for each user, and once that limit is reached, there is no room to accept new incoming mail. The following are all examples of email error messages caused by a full mailbox:
[email protected]: User is over the quota. You can try again later.
[email protected]: host in7.example.com said:
552 [email protected]... Mailbox is full
Mailbox limit exceeded while appending message
550 [email protected]... Can't create output
[email protected]: host mail9.example.com said:
552 Requested mail action aborted: exceeded storage allocation
This error will stop as soon as the recipient makes additional room in their mailbox (usually by removing old messages from the server), so you should probably resend your message a little later. However, especially with free accounts, this message could actually mean the user no longer checks the account; a good rule of thumb is if you continue to receive this error for more than two weeks, it is likely that the account is no longer in use.
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Message exceeds size limit
[email protected]: host host.example.com said:
552 Message size exceeds fixed maximum message size (5000000)
[email protected]: host mx2.mail.example.com said:
552 message size exceeds maximum message size
[email protected]: host mx01.example.com said:
552 Message size exceeds fixed maximum message size: 5242880 bytes
These errors mean that the size of the message, including all headers, text and attachments, exceeds the domain's maximum per-message size limit - essentially, that your email is too big to be accepted. You should try to reduce the size of the message, or try to split the email into smaller parts and resend it.
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Other types of errors that should be quickly fixed can be caused by users misconfiguring their own email accounts. For instance:
Improper forwarding causing mail loop
554 Too many hops 27 (25 max): from [email protected]
via mail.firstdomain.com, to [email protected]
In general, a "too many hops" error indicates a mail loop: the user has two accounts, forwarding to each other, which creates an endless loop. A message sent a Pen Publishing account is forwarded to another mailbox; if that account is set to forward to Pen Publishing, then a mail loop is created: mail goes from Pen Publishing to the mailbox back to Pen Publishing back to the mailbox, et cetra, until the loop is ascertained and the message returned to its sender.
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Permanent Problems
The most common permanent user problem is, of course, User Unknown. The account you are trying to mail no longer exists - it may have been shut down, or you may have misspelled the username or domain (make sure you check email error messages carefully). The following are all examples of User Unknown messages:
[email protected]: host host.example.com said:
550 [email protected]... User unknown
[email protected]: host mail7.example.com said:
550 Requested action not taken: mailbox unavailable
[email protected]: host mail.example.com said:
550 5.1.1 [email protected] is not a valid mailbox
[email protected]: Sorry, no mailbox here by that name. (#5.1.1)
[email protected]: host example.com said:
550 Invalid recipient [email protected]
The message that you sent was undeliverable to the following:
[email protected] (user not found)
If you receive a user unknown bounce, and you have checked to make sure the address is correct, the next thing you should do is try to contact the person you were trying to email by other means. Frequently, people are not aware that they are bouncing email until someone else tells them. Also, do not delete the bounce message. It can help the user and their ISP resolve why they are bouncing mail more quickly.
If you do not have other means to contact the person who is bouncing mail, you probably have a dead email address. Try mailing them one more time (preferably at least a day later) in case it was a technical problem, but after that, stop using that email address. If you run a mailing list, and one of your subscribers starts bouncing mail with this error, remove them from the list.
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Domain Error Messages
Most of the time, when a domain has an email problem, they learn about it very quickly from their users, and in addition, it is relatively rare for an entire domain to simply disappear, so most domain errors should be considered temporary, and will likely be remedied soon -- resending mail a little later is usually your best option.
Connection Timed Out / Connection Refused
[email protected]: connect to 172.16.22.213: Connection timed out
A "connection refused," or "connection timed out" message usually results from high volumes of mail being processed at the time your message was received. This could be due to the server receiving more mail then it is used to, a external attack on a domain (such as a mailbomb) or an internal setup problem, causing the domain's mail servers to refuse connections or cut connections before a message is fully sent. Mail exchangers are set up to only accept as much mail as they can handle, so when problem is resolved, you will be able to send your mail without problem.
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Domain Not Found
[email protected]: Name service error for domain domain.com:
Host not found, try again
A "domain not found" error means that the domain name to which you sent the message does not exist. Usually, this means you misspelled the domain name, but it may indicate a problem with the domain's record that prevents the domain from being found. There is another Domain Not Found error: "Sender Address Rejected: Domain Not Found"; for more information, please see Domain Not Found: Anti-Spam error below.
Relay Access Denied
Another domain error that can be due to either the sender's or recipient's domain is a relay access denied error:
[email protected] host wormwood.example.com said:
554 [email protected]: Recipient Address rejected:
Relay access denied
This error indicates that, somehow, a message intended for a Yahoo.com address found its way to our example.com mail server, and since our server doesn't accept mail for yahoo.com, the message was rejected. It is quite rare, actually, to reach a completely incorrect mail server when sending email to a domain, so if you receive this message, the problem is usually a misconfiguration error with the receiving domain (for example, if you receive notice that mail sent to a Pen Publishing user was rejected by a Pen Publishing mail server with this "Recipient Address rejected," error, this could indicate a problem with our mail servers, since Pen Publishing's mail servers obviously should accept email for Pen Publishing users. Or, it could indicate a problem where the sender's system isn't looking the mail server up correctly).
Another reason for receiving this error is the possibility that a domain has recently changed hosts, and while the change has taken place, the new domain record has not yet propagated fully, and your message reached the old hosting company which no longer accepts mail for the leaving domain. If you receive this error, try resending your message twenty-four hours later.
Another Relay Access Denied error exists: "Sender Address rejected: Relay Access Denied"; this is actually an anti-spam bounce, so please see Relay Access Denied: Anti-Spam bounce below.
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Anti-Spam Error Messages
System administrators frequently set up their systems to refuse mail from spammers, but since no spam filtering system is perfect, your message may have been caught in the spam block. Some of the most common:
Spam blocks
[email protected]: host ntserver.example.com refused to talk to me:
550 Permission denied
or contains a creative note, such as:
[email protected]:
connect to domain.net: 550 Connection refused - we hate spammers!
These errors mean that your provider's domain name (or specifically, your email address) is explicitly listed as a known spammer on a blacklist. This may be based on an external service that provides blacklists of known spammers to ISPs, or the administrator may have placed a block based on a large volume of mail coming from your domain. Most of the time, your email provider will need to contact the system administrator to have the block removed, so you should contact your provider immediately. Assuming that your provider is, in fact, not a spamming service, they will want to act quickly to get themselves removed from these blacklists.
There are two other anti-spam error messages that are very, very similar to some of the domain errors shown above. The first is a Domain Not Found error, where the sender's domain could not be found:
[email protected]:host img10.ppi.net said: 554
<user@fake_domain.com>: Sender Address Rejected: domain not found
Unlike the Domain Not Found error shown above as a domain error, this is an anti-spam bounce. Notice the "Sender Address Rejected"; this means that the problem is actually with the Sender's email address - specifically, that the domain used in the sender's email address was not a valid domain. When a mail server receives an email for one of its users, the server checks to ensure that the sender's domain is a real domain - if the domain name does not resolve, the message is rejected with the "Sender Address Rejected" error. This is an anti-spam error in that it prevents mail servers from accepting spam where the domain is completely fake, meaning the message could not really have originated there.
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The other type of "554 Relay Access Denied" error is a problem with the sender using the wrong mail server to send their message:
[email protected] host smtp-gw-4.example.com said:
554 [email protected]: Sender Address rejected:
Relay access denied
Essentially, this error message is similar to a Recipient Address rejected, in that the server reporting the error does not like the domain name; however, in this case, the problem is that the outgoing email server did not like the domain of the sender's email address (as opposed to the above Recipient errors, where the incoming mail server does not like the recipients domain).
What this error generally indicates is that the outgoing server you're using (usually the one assigned to you by your ISP) will not accept email with the From: address you've used on the email. For example, domains such as BellAtlantic.com, GTE.net, and Verizon.com do not allow users to send email their outgoing mail server if the "From" email address used on the message is not the one assigned by them (e.g. you can't send out mail that uses your Pen Publishing address as the From: header via their mail servers).
Many ISPs have begun to enforce these restrictions to prevent spammers from using the ISP's access and SMTP server to send spam. To remedy this error, you will need to use the email address assigned to you by the provider as the From: address on outgoing
if John,smith works in Microsoft then his email address will [email protected]
But for example if you dont work with any company and still want to have email . Then today we have multiple choice
where we can get free email address -
If John wants to get free email then he cant get from GMAIL
Every Google Account starts with 15 GB of free storage that's shared across Google Drive, Gmail, and Google Photos. When you upgrade to Google One, your total storage increases to 100 GB or more depending on what plan you choose.
Famous email providers
Gmail
AOL
Outlook
Zoho
Mail.com
Yahoo! Mail
ProtonMail
iCloud Mail
GMX Mail
Mozilla Thunderbird
Yandex Mail
I think today it is not realistic. You won't be successful that way. Today you need not just a mailbox, but the best virtual mailbox, which has great functionality.
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