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Questions tagged [email]

The server configuration of email, including POP3, SMTP, IMAP, and popular server software packages that control email.

The server configuration of email, including POP3, SMTP, IMAP, and popular server software packages that control email.

6589 questions
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Using a CNAME to forward traffic from a naked domain

I have a domain, flyh2.com. I use a CNAME to forward www.flyh2.com to flyh2.elasticbeanstalk.com where my web site is hosted. This is the only way Amazon allows custom domain names. A records aren't allowed. I'd like people to simply type…
sparkyspider
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BCC every incoming and outgoing e-mail in Microsoft Exchange

A content inspection system wants to inspect every e-mail that is sent or received outside organization's boundary (e.g. from/to Internet). I do not want to put the inspection system in-line as an SMTP gateway for availability reasons, I would much…
Konrads
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Postfix: Helo command rejected: Host not found

i have a Postfix 2.9.6 running on Ubuntu with the following configuration https://gist.github.com/anonymous/400fb4afa05e18c6da2b and i'm suffering the following issue where a valid client tries to send an email to itself. Most of my clients does…
peris
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Domino always server fails to send SMTP email at first attempt

In our logs, we find the below: Router: No messages transferred to example.com (host mx.example.com) via SMTP: The server is not responding. The server may be down or you may be experiencing network problems. Contact your system administrator if…
kkr16
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Do I need an MX record for my main domain?

Let's say I have several domains. bossguy.com is the domain that hosts my mail (IMAP server) and where I ssh in to manage other domains, for example: domain1.com domain2.com domain3.com It makes sense to set up MX records for domain1/2/3.com to…
CaptSaltyJack
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SMTP routing cases: same @domain as sender and different @domain

I would like to know what is the difference between sending an email to the same @domain as the sender and sending to a different domain. I cant really find a detailed explanation on the web. From my knowledge the MUA queries the DNS server for an…
dragosb
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How is DNS resolved for email addresses?

If I send an e-mail to gus@example.com, how does my e-mail client find out what IP address to send the e-mail to? I understand it would do a DNS lookup for example.com, but I want to know what records would be used exactly. I can send e-mail…
Gus
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How do I generate a certificate for multiple mail addresses?

At my company, we have short mail addresses for convenience, but they collide now that the company gets bigger. For new employees, we only make new longer mail addresses to avoid this. However, to migrate the old short ones to the longer new ones, I…
sinned
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Getting error 421 4.3.2 All server ports are busy

I am running postfix on debian wheezy with Dovecot and I had spam issues with a php script . after finding and removing the script I am unable to send any mails from squirrel mail from my browser. I get ERROR: Message not sent. Server…
user3067037
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Exim retry is Message based instead of host based? why

from what I understand exim retries are supposed to be HOST based, NOT message based. This seems to make sense to me; if a host's server is overloaded or otherwise telling you to "delay sending messages", it would seem to be bad form to delay the…
Ben A. Hilleli
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Postfix Stagger/Rate Limit Outbound Mail

We have a server that sends our weekly newsletter to subscribers, To prevent people like Hotmail or Yahoo from blocking us due to sending too many simultaneous emails to them, Is there a way we can stagger email, or rate-limit outbound emails from…
grufftech
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how to Dedupe email messages in exim mail server (Linux)

If a User is listed in multiple aliases or multiple mailing list or groups a message is sent to more than one of the aliases, mailing list or group the end User will receive multiple copies. How to prevent to receive multiple copies to a user listed…
user205006
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vps: smtp working on server client (roundcube) but cannot be configured on desktop client

I've bought a VPS and installed Ubuntu 12.04 on it. I'm using Zpanel for my Control panel and everything seems to be configured well. I can even send and receive mails on my server itself, via the server client 'Roundcube'. However, when I try to…
Sander Schaeffer
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Postfix not recieving mail from actual email but does from sendmail?

Ok so I'm trying to forward mail from my ubuntu server (lets call it example.com) to a external gmail account using postfix. The problem is when I send mail using another gmail and yahoo account to monkey@example.com, and I check var/log/mail.info,…
bnynn
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Exchange 2010 550 5.1.1 Recipient Rejected Error

About 3 weeks ago, we migrated our email solution from one hosted Exchange 2003 environment to another hosted Exchange 2010 environment. I currently have an outside user unable to send emails to our email. Our receive connector has anonymous users…
nocode
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