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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.

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Confused about alias_maps and virtual_alias_maps

I have already re-read the docs on this as well as other posts here and this is still very unclear to me. I have been testing various things to understand the difference between alias_maps and virtual_alias_maps and I don't see the use of these 2…
Neel
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Can cron write job output to a log *by default* (instead of mail)?

We all know the right way to handle output from cron jobs is to redirect it to a file: 0 * * * * /bin/date >> /var/log/date.log 2>&1 However, sometimes admins are lazy, forgetful, or ignorant and don't put in those redirects; in this case the output…
Brad
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What would you do if you realized your email hosting provider could see your passwords?

We received an email last year from our hosting provider regarding one of our accounts- it had been compromised and used to deliver a rather generous helping of spam. Apparently, the user had reset her password to a variation of her name (last name…
Austin ''Danger'' Powers
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Why is it a bad idea to use a customer email as the from address

I've got an application that emails users once they have filled in a form. It uses a no-reply@customerdomain.com as a from address. The customer wants it to use the email from the form as the from address which could be anything. I have been told…
Crab Bucket
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Legitimate reasons SMTP “MAIL FROM:” will not match “From:” Header in DATA

Is there ever a legitimate reason for the SMTP “MAIL FROM:” field to not match the “From:” field in the DATA section of a message, besides mailing lists? From…
dkovacevic
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Prevent mail being marked as spam

This is a canonical question about avoiding outgoing mail being classified as spam. Also related: Fighting Spam - What can I do as an: Email Administrator, Domain Owner, or User? What are SPF records, and how do I configure them? I'm…
jonepatr
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Dovecot vs Courier vs Cyrus

What is best for a Personal/SMB mail server running on an Ubuntu Server (8.04+)? I want to setup my own mail server at home to evaluate some options for my company before I make a recommendation. Which is the most secure, efficient, and reliable?…
wag2639
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What kind of mail server do you use?

There are a lot of mail servers out there. Microsoft Exchange has been the dominant corporate mail server in the enterprise on Windows, but I've been using Kerio Mailserver for a long time now and am still wondering if there aren't any better…
Huppie
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Is the 10-DNS-lookup limit in the SPF spec typically enforced?

My understanding is that the SPF spec specifies an email receiver shouldn't have to do more than 10 DNS lookups in order to gather all the allowed IPs for a sender. So if an SPF record has include:foo.com include:bar.com include:baz.com and those…
John Bachir
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How should I test Clam Anti-Virus?

I have setup a new email server and now I need to test that Clam Antivirus is scanning messages correctly. How should I do this in a safe and controlled way?
karthick
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Email hoarder intervention and education - (Exchange environment)

Throughout my career, I've encountered quite a few users who were email hoarders... I'm managing a 100-user environment where users previously had 100mb quotas and a basic Cyrus IMAP/Postfix solution. That led to lots of locally-stored mail and the…
ewwhite
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Is it safe to use procmail in 2017?

I just discovered that procmail website (http://www.procmail.org/) is down. I did some research about its status and it appears that the development of procmail has been dead since 2001. Even the old procmail maintainer recommends to remove it from…
JooMing
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What happened to all the spam?

Don't get me wrong, I'm mostly glad that this happened. However, I want to make sure that the reasons for it happening are sound - rather than there being a problem with our methods. I'd like to illustrate what's going on here with a…
Ernie
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Does Exchange support plussed users (e.g. myname+spam@example.com) or a similar mechanism?

Sendmail supports a feature called 'plussed users'. Once enabled, emails sent to myname+spam@example.com, myname+sometopic@example.com and myname+anything@example.com are automatically delivered just like mails to myname@example.com. There is no…
Jens Bannmann
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Amount of allowed subdomains in domain and email

How many subdomains can you have on your domain? And with that, I mean levels of subdomains. For example, you have the domain example.com, I know you can have test.example.com, but how many levels can you have? Like test2.test.example.com,…
Joshua Bakker
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