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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

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Adding IP addresses to IIS Virtual SMTP server en masse - is it possible?

So, here's the problem: I have to configure Connection Control IIS virtual SMTP server on Windows Server 2003, to be exact, which IP addresses can use the server. So, I run IIS Manager, open SMTP Virtual Server Properties, open Access tag, click on…
user905747
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How to send email from non-TLS enabled client through TLS-only Gmail account

I need to be able to send email from a client (an OKI document scanner) which is non-TLS capable. But my company's email service is provided by Gmail-Google Apps, which is configured to force TLS authentication. Therefore the scanner cannot connect…
Rodrigo Serrano
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SMTP Error 5.7.1 when sending external mail to sharepoint

I have SharePoint setup to receive mail from exchange 2003 and all works great internally. However when I send a mail from a external source it fails with a 5.7.1 error. I have setup a SMTP connector in exchange for the name space and allowed…
Stooie29
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Check if an e-mail address exists before sending

Is there a mechanism for verifying an e-mail address exists before sending?
donald
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How to install POP3 and SMTP in Postfix?

I have Postfix installed on an Ubuntu box, but now I need to configure POP3 and SMTP. Is there some guide on how to do this?
André
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Network Hardware supports SMTP, but no AUTH information... Need to Send emails through SMTP with AUTH

I have a network device that supports sending email notifications, but doesn't provide for the username and password. I would like to point this device to an internal system which would then take care of sending the email using our actual email…
AJ.
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Mail not relaying in postfix

I am managing a server which mainly deals in relaying mail using virtual alias maps. For some reason unknown to me email that goes through these maps are getting bounced. I've checked to make sure the domains are in my virtual_alias_domains table…
devnill
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Windows mail server that supports username wildcard aliases?

Is there any free mail server (in this case POP3) for Windows that supports aliases? e.g. User name: iboyd Aliases: ian@serverfault.com ian.*@serverfault.com amanda@serverfault.com *@ianboyd.com User name:…
Ian Boyd
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What's a good open source solution that supports push e-mail?

Currently using Exim4 + courier-imaps + spamassassin but would like to get push e-mail on my iPhone and Android devices!
ensnare
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Exim: Use remote_smtp or smarthost for failover

I've got a server with exim4 and a smarthost in front of it, the use of the smarthost is mandatory, the university closed down port 25. However, on IPv6 this port is open. So when the receiving server has an IPv6 address I could send it directly. So…
blauwblaatje
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Is there an easy way to setup "example.com" MX records?

I'm used to use /etc/hosts to fake "example.com" or other domains to point to my local web servers to make tests. I'm trying to do some filtering tests on a multi-domain postfix and I need to fake several domain names to check how it responds…
theist
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Recommended SMTP Relay Service

I've got a legacy application that needs an smtp server to relay emails. Each client has various control over their IT infrastructures (from little to none at all), so I can't necessarily install an smtp server on each of their machines. Can anyone…
Ryan
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postfix not transporting mail

I am setting up a mail server using postfix and dovecot. I am using virtual users that are stored in a sql database. I've checked the mail queue is empty and the logs show that the mail is received but not forwarded. I've posted the relevant parts…
devnill
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Windows Server 2008, can't connect on local SMTP Server into localhost

I can't connect on local SMTP Server into localhost. It just from external servers. Firewall Disabled. The command was "telnet localhost 25". And the result was: Connecting To localhost...Could not open connection to the host, on port 25: Connect…
André Möller
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What does it mean to setup Postfix as “SMTP only”?

I am trying to setup Postfix a few different domains on a virtual host. I need to have email setup just to send out registration confirmations and new password requests. No one will have a mailbox on this server. It seems this means that I want to…
BryanWheelock
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