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

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6
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3answers
198 views

What is DNS TXT record “mailru-verification”?

Sometimes I see this mailru-verification DNS record. I've Googled - and Yandexed ;) - but I found nothing about it. I suspected that is a kind of russian SPF implementation... dig example.com TXT ...
6
votes
1answer
1k views

amavis cronjob throwing an error out of nowhere

Can someone explain why amavis cronjob is suddenly trowing the following error? Cron <amavis@bee> test -e /usr/sbin/amavisd-new-cronjob && /usr/sbin/amavisd-new-cronjob sa-sync rules: ...
6
votes
1answer
8k views

How can I configure Horde under cPanel to display HTML emails? [closed]

In cPanel, Horde does not display rich text/HTML emails by default, it only displays the plain text version. I know there is an option to display HTML emails, but I am not sure how to enable that ...
6
votes
5answers
6k views

Hotmail Sender ID always fails with “temperror” regardless of SPF

When we send mail to Hotmail servers, they do not recognize our Sender ID. In the receiving mail source, it reads Authentication-Results: hotmail.com; sender-id=temperror ... when it should say pass ...
6
votes
2answers
2k views

SPF vs. DKIM - The exact use cases and differences

I'm sorry for the vague title. I don't fully understand why SPF and DKIM should be used together. First: SPF can pass where it should fail if the sender or DNS is "spoofed" and it can fail where it ...
6
votes
1answer
158 views

How can I use Postfix to track/log the HELO name that IPs are communicating to it with

I am using Postfix as an internal mail relay server, and we have several servers internally running all sorts of custom code, some are packages/services, and some of it is native Linux or Windows ...
6
votes
3answers
9k views

Postfix Relay to Office365

I am trying to setup a Postfix server on a Linux box to relay all mail to our Office365 (Exchange, hosted by Microsoft) mail server, but, I keep getting an error regarding the sending address: ...
6
votes
5answers
6k views

Email sent from server with rDNS & SPF being blocked by Hotmail

I have been unable to send email to users on hotmail or other Microsoft email servers for some time. Its been a major headache trying to find out why and how to fix the issue. The emails being sent ...
6
votes
1answer
27k views

How to configure sendmail to send email via GMail (smtp.gmail.com), using port 465 or 587?

I have configures sendmail to send email via my GMail (Google Mail) account, i.e. via smtp.gmail.com, by editing /etc/mail/sendmail.mc and regenerating sendmail.cf: -dnl define(`SMART_HOST',`smtp....
6
votes
3answers
2k views

How to avoid automatic responses from putting our mail server in a loop?

I have a mail server X which acts as a middle man between the customers (A) of our feedback applet, created to be used in their websites, and customers (B) of our customers. So, whenever B sends ...
6
votes
1answer
3k views

Amazon SES e-mails ending in Yahoo & Hotmail Spam folders, even though SPF and SenderID and DKIM are set correctly

This is incredibly frustrating. My Amazon SES e-mails are ending in Yahoo & Hotmail Spam folders, even though my SPF, SenderID, and DKIM are setup correctly. Since this particular site requires ...
6
votes
2answers
777 views

Setting up a forwarding-only email server

All I want to do is install postfix, and forward emails. I don't need anything to stay on my server. This is giving me hell. I tried the best I could, but postfix is denying all relays. What I want ...
6
votes
3answers
6k views

Setting up DKIM for multiple domains on same host

I have DKIM set up for one domain and it works properly. I am trying, though, to set it up for another domain name on the same machine. In short, I am sending registration and password recovery emails ...
6
votes
2answers
663 views

Fully FOSS EMail solution

I am looking at various FOSS options to build a robust EMail solution for a government funded university. Commercial options are to be chosen only in the worst case scenario. Here are the requirements:...
6
votes
2answers
3k views

Does Exchange support disposable e-mail addresses?

Sometimes it is useful to have e-mail address like foo-randomnumber@example.org, where randomnumber identifies the conversation between a robot such as a mailing list server and a user. Is this ...
6
votes
3answers
679 views

Are there any options for implementing disposable addresses on Exchange 2007?

Gmail allows you to use something frequently referred to as plus addressing or sub-addressing. Can Exchange 2007 be configured to do something like this? Or are there any 3rd party applications that ...
6
votes
1answer
2k views

How to find out users without SEND AS SELF flag in Exchange 2010

I'm looking for a way to find all users who don't have SEND AS SELF flag set in Exchange 2010. Without that flag users aren't able to send emails thru SMTP and it seems some users are missing this ...
6
votes
1answer
7k views

Exchange 2010 Out of office doesn't show original senders email address

When one of our users is on holiday they will set their Out of office message and change the Out of office rule to forward all emails received to a colleague. This has always worked very well for us ...
6
votes
1answer
565 views

Avoid creating backscatter on a Postfix forwarding server

I run a Postfix server that hosts a small, alias-based mailing list. Let's say people@myserver forwards to alice@someprovider and bob@someotherprovider. Now, alice@someprovider might use a more ...
6
votes
2answers
4k views

E-mail addresses with plus sign in MS Exchange [duplicate]

Possible Duplicate: Does Exchange support disposable e-mail addresses? Many users like to use e-mail address in the format "[user]+[tag]@[domain]" to facilitate local filtering of incoming ...
6
votes
2answers
619 views

Exim backscatter

One of my relays has been listed on backscatter.org, now I'm trying to configure our existing config only to send bounces to local users only. Does anyone knows how I deal with this issue? I've added ...
6
votes
1answer
56 views

How Does Low Volume Affect (esp. live.com) Email Deliverability?

I've been sending emails for years with out any serious reputational shocks, but with low IP volumes (no bulk mail or automated transactional email), even with multiple Domain names. My Gmail ...
6
votes
2answers
970 views

How switching off SSLv3 in Courier-IMAP server affects old Mail User Agents?

I would like to mitigate POODLE vuln. in my courier-imap server. I know how to do it. I'm really concerned on how it will affect MUA's, especially the older ones. There are still users using Outlook ...
6
votes
2answers
2k views

Get individual message size for all Exchange 2010 users

I need to make a report with a list of the largest messages on an Exchange 2010 server. I looked through the commands that I could use, and Get-MailboxStatistics isn't granular enough - I need to find ...
6
votes
1answer
3k views

Applying ACLs to a Dovecot public namespace

I would like to provide access to some mailing lists via a set of public, read-only mailboxes in Dovecot. I have a public namespace define in my dovecot (dovecot-2.0.9) configuration that looks like ...
5
votes
8answers
5k views

Should our company allow employees to forward their Exchange email to GMail?

Many developer prefer the GMail interface and thus forward (actually pull) all their email to GMail. Assuming we trust Google, are there any reasons why this should be disallowed? Edit: Interesting ...
5
votes
7answers
9k views

Acceptable load average

We deployed our new Linux/Exim/Spamassassin mail server on Friday (always a good idea to deploy the day before a long weekend when no admins are around). The load has been hovering around 1.3 on the ...
5
votes
6answers
2k views

Email notification about each SSH connection to Linux server

I would like to be notified about each SSH connection to the Linux (Debian) server. Already saw some methods, which proposed to add mail command into own .bashrc, but this approach seems not to cover ...
5
votes
10answers
3k views

How to recover outlook emails

It has happened many times in my organization that some people have left in not really good terms. So when you go to check their computers you find that they normally delete their emails, sometimes ...
5
votes
6answers
1k views

Outsource my email server to Google

I've been looking into setting up my own email server the past couple of weeks and the more I look into it the more I feel that this is an area I do not want to get into. I guess my heart just isn't ...
5
votes
3answers
6k views

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?
5
votes
5answers
10k views

AOL is rejecting emails from my client's website, how can I troubleshoot?

I am a bit of an email noob. My website is trying to send email from a contact form using the PHP mail function. This works fine when sending it to my Gmail account, but AOL rejects it. I have set ...
5
votes
3answers
1k views

Email Attachment Size Limits

Given I have plenty of disk space to work with, what are some technical considerations that I need to consider when configuring email attachment size limits?
5
votes
4answers
4k views

How can I configure my server to notify me whenever it is remotely accessed via ssh?

I need to be notified by email when my Ubuntu server is accessed via SSH. If it is possible, how can I do it?
5
votes
2answers
6k views

Why an empty MAIL FROM address can sent out email?

We are using Smarter Mail system. Recently, we found that hacker had hacked some user accounts and sent out lots of spams. We have firewall to ratelimit the sender, but for the following email, the ...
5
votes
4answers
7k views

Do i need to open 25 port to send emails with the php mail function?

I have a Linux web app. Do I need to open port 25 to only send emails using the PHP mail function? If I have to open port 25, how can I disable receiving emails? Edit: I am asking because I ...
5
votes
3answers
399 views

Is SPF enough to make sure emails get delivered to inbox?

So I just succesfully set up postfix + dovecot. is SPF enough to make sure emails get delivered to my website's users? I don't want my emails to end up in their spam box.
5
votes
3answers
9k views

Does anyone have real-life examples of e-mail being intercepted?

As anyone will tell you, e-mail is not secure. It travels around the Internet in plain text and we should not use it for sending passwords and other sensitive details. For years I've been designing ...
5
votes
4answers
3k views

How to send 100,000 emails weekly and avoid being considered spammer

I have a mailing list with 100,000 email addresses, and I have to send it an email weekly. What application/program/webapp/script/etc do I have to use to send 100,000 emails weekly and avoid being ...
5
votes
1answer
190 views

Is an MX record needed?

We have a testing server with its own domain name. We don't want any email to be sent from this domain. We don't want any email to be received on this domain. Is it ok to remove the MX record ...
5
votes
5answers
1k views

Demanding your clients to change extensions from .zip to .txt for mail attachments

A company we are working with has a few ridiculous security measures. One of them goes like this: You cannot e-mail us .zip files. If you want to transmit a .zip file, rename it to .txt. IMHO, ...
5
votes
6answers
2k views

Prevent outgoing spam

What are some ways to prevent spam from leaving your servers should a hosting account get compromised? Have a bunch of clients on a server with cpanel but wondering if there was a way to just ...
5
votes
5answers
4k views

Does it really matter what your server's hostname is?

I'm kind of hesitating if I should use a subdomain or just a plain word as hostname. E.g. my domain name is domain.com and my server's hostname ip1.domain.com. This might be a strange question but ...
5
votes
4answers
2k views

ptr for a subdomain

I’m feeling lost in DNS; please help me get back on track. I’ve got a domain. Let’s call it example.com. And I can add DNS entries for subdomains of type A and CNAME. I have another server which I ...
5
votes
2answers
395 views

What is push email?

Looking for a true technical explanation on this.
5
votes
1answer
9k views

Office 365 routing of internal domain messages

Our office uses both office 365 and Google apps. We were on Google apps first, and decided to give office 365 a try. Some folks liked it, some did not, and want to revert back to Google apps for mail. ...
5
votes
2answers
4k views

Postfix: How to accept email from a specific non-existing domain?

We need to accept email from a server that sends out using a non-existing domain. That server is not under my control. In my main.cf I have smtpd_client_restrictions = permit_mynetworks, ...
5
votes
5answers
3k views

What are the options for sending legitimate bulk email?

I've got a new client that wants to send batches of around 1000 emails weekly to their client list (all opt-in recipients). Previously when I've built something for a client it has been their own ...
5
votes
1answer
4k views

Full status information in Nagios email notification?

I have set up Nagios to monitor my servers and I have written a few custion checks. When I get a notification email, I only get the first line of the status information and I have to use the web ...
5
votes
3answers
555 views

How to get Postfix statistics of second instance?

I have a quick question. I have two instances of Postfix running on an Ubuntu server and I want to write some scripts to email our server admin Postfix statistics (queue count, sent, etc). How would I ...