Server Fault Stack Exchange
Server Fault Stack Exchange

Questions tagged [smtp]

SMTP is the Simple Mail Transfer Protocol, the most recent standard of which is defined in RFC 5321. It's the Internet standard for sending and receiving email.

Some characteristics of SMTP (Simple Mail Transfer Protocol):

  • The default port is TCP port 25 and new submissions (MSA) is port 587.
  • Although depreciated, some services still use port 465 (SMTPS) to support legacy applications.
  • It is used to transmit outbound mail, and mail servers (which listens on port 25) receives mail on port 25.
  • It should not be confused with POP3 / IMAP which is an actual store for the e-mail. SMTP messages are received by the receiving server and then an MTA moves it to the POP3 / IMAP mailbox where it is normally retrieved using a POP3 / IMAP client.

See Also:

RFC5321

3133 questions
1
vote
2 answers

Postfix - am I sending spam?

today I received like 30 messages within 5 minutes telling me that some mail I send could not be delivered, mostly to *.ru email addresses which I did not send any mail to. I have my own webserver (postfix/dovecot) set up using this guide…
olrehm
  • 191
  • 3
  • 8
1
vote
2 answers

Exchange 2003 SMTP SSL and various email clients

This Exchange 2003 server sits behind a firewall with a virtual SMTP server listening on port 465 and attached an SSL certificate from Comodo to the virtual server. However, when trying to send from Apple Mail.app 4.x and Outlook 2011 for Mac, it…
FrancisV
  • 1,766
  • 3
  • 16
  • 18
1
vote
1 answer

Setting up SMTP to receive mail

Thanks to a post on StackOverflow, I was keen to discover that I can set up SMTP in IIS6 to receive mail on my Windows 2008 server. However, I'm having a bit of difficulty as my test email results in a 'Delivery Status Notification - 5.3.5'…
Jonathan
  • 1,309
  • 2
  • 22
  • 29
1
vote
1 answer

Difficulty in setting up SMTP on my server

I'm setting up my server for the first time and I've run into an issue in trying to send mail using SMTP. As per the suggestion of a few answers on SF, I've used SMTPDiag to try and diagnose the issue and it seems the issue is 'Failed to connect to…
Jonathan
  • 1,309
  • 2
  • 22
  • 29
1
vote
1 answer

How to parse e-mail bounce notifications

What options do I have to parse the e-mails that have bounced? I am receiving the bounce notification from e-mail servers but don't know what to do with it. Thanks Edit: I just want to know how to do it. If I receive 30k bounces per day, how can I…
donald
  • 453
  • 2
  • 6
  • 17
1
vote
3 answers

Set default mail sender on linux (PHP)

Whenever i send an email in php with the mail() function, when i receive it as a user, the e-mail is shown as sent from "anonymous@MyServerName.local". Now i want that to be sent from "mail-bot@mydomain.com" as a standard, without having to set the…
Kristoffer la Cour
  • 113
  • 1
  • 5
1
vote
1 answer

ESMTP MailEnable with PHP

I am running a windows server (windows 7) with IIS 7. ESMTP MailEnable is running on port 25. I am also running apache and php on the server. When I use php's mail() it returns false indicating that it can't connect to the outgoing SMTP server…
Explosion Pills
  • 221
  • 1
  • 2
  • 10
1
vote
3 answers

IMAP/POP won't send allow emails to outside with SBS 2011

I have a brand new out of the box Dell PowerEdge T310 running SBS 2011. Our employees at our remote offices can't send emails to recipients outside of our own domain. The workstations at the same location as the server aren't having any problem. I…
user779887
  • 59
  • 2
  • 7
1
vote
2 answers

SMTP Relay to capture attachments

Does anyone know of FOSS solutions (or general information) on setting up a Linux-bases SMTP mail relay that can do the following: Detect if a message has an attachment if so, save the attachment to a web-based storage solution remove the…
Larry G. Wapnitsky
  • 111
  • 4
  • 15
1
vote
1 answer

Postfix/Rejecting mails

How do I make Postfix to reject all mails if the client is not authenticated and to sender is @mydomain? Is the an easy way to do this? Max
bot47
  • 317
  • 1
  • 4
  • 17
1
vote
1 answer

How to get list of sent emails in smtp virtual server in iis 6.0 on windows 2003

How to get list of sent emails in smtp virtual server in iis 6.0 on windows 2003
Nitin Sawant
  • 113
  • 1
  • 5
1
vote
1 answer

How do I enable an smtp server to my own domain?

I have a VPS with cpanel and I'm attempting to setup my own SMTP server so that I can use smtp.mydomain.com. I've looked at a server in which this is already setup, and if I go into WHM > View Relayers I can see the domain name is entered there,…
willdanceforfun
  • 557
  • 2
  • 11
  • 23
1
vote
1 answer

postfix smtp_get: EOF

I'm using postfix (incomming port 25) + SpamPD (127.0.0.1:10025 relayhost:127.0.0.1:10026) for filtering incoming email, which are coming from internet for my remote MTA. MTA which holds virtual domains is running on a seperate machine. So for users…
User4283
  • 781
  • 3
  • 10
  • 27
1
vote
3 answers

How to use different address for pop.gmail.com

I've been searching for a way to hide the gmail server name (pop.gmail.com and smtp.gmail.com). I want the email client (outlook) to point to our own server (say, pop.myserver.com), which in the end route to the real server. I tried the DNS CN…
Hendry Ten
  • 113
  • 2
1
vote
2 answers

How can I send email notifications from an app that does not support TLS when my service requires TLS?

We have recently changed the email services. The previous service allowed us to make SMTP connections without TLS. The new service requires TLS. We have a couple applications that need to send email...and (of course) they do not support TLS. To…
Doug Clutter
  • 141
  • 5
1 2 3
…
99 100