Refers to the hardware or software that make up a server dedicated to sending and receiving emails. Many popular modern email servers bundle other functionality for contacts and calendaring along email delivery.

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34
votes
4answers
3k views

Is greylisting still an efficient method for preventing spam?

I've used greylisting on my servers for many years, but I don't know how effective it is nowadays. Is it still good for fighting spam in 2012? Or is the typical spammer MTA capable of resending ...
20
votes
4answers
3k views

Best Practices for preventing you from looking like a spammer [duplicate]

I'd like to feel more confident setting up mail for my clients with regards to false positives. Here's what I know: SPF records are good, but not every spam filter service/software (SFSS) uses ...
19
votes
4answers
11k views

Why Does hotmail still reject my emails?

I have a very strange problem with my emails being marked as spam by hotmail. I just have configured Postfix + Dovecot on my server and all works perfectly. I can Send/Receive emails. I only have ...
17
votes
12answers
11k views

Which anti spam DNS blacklists should used?

i want to protect my mailserver with dns blacklists for fighting the spam. there a so many blacklists out there. currently i use: ix.dnsbl.manitu.net cbl.abuseat.org bl.spamcop.net ...
14
votes
1answer
18k views

What ports to open for mail server?

I have just finished setting up a Postfix mail server on a linux (ubuntu) platform. I have it sending and receiving email and it is not an open relay. It also supports secure smtp and imap. Now this ...
14
votes
6answers
3k views

How difficult is it to setup a mailserver?

I want a secure mail solution, as I am looking to move away from Google and other parties looking into my private data. How much of a PITA is it to setup my own mailserver? Should I go for an ...
12
votes
4answers
24k views

Mail server for Windows 2008

I'm going to get a Windows 2008 dedicated server sometime soon. I'm going to have my website hosted on it, so, I also want to run a mail server on the same machine to receive any mail sent to the ...
12
votes
3answers
10k views

what is sensible-mda and do i need it?

I'm running Ubuntu Intrepid, and have been seeing the following my logs: Aug 23 16:01:03 wp1 sm-mta[13700]: n7NFJIad013566: Warning: program /usr/sbin/sensible-mda unsafe: No such file or directory ...
11
votes
4answers
6k views

Do SPF Records For Primary Domain apply to subdomains?

I have a quick question regarding SPF records: Do they need to be present for all subdomains? Lets say that I have a TXT record with SPF info for domain.com Let's also say that I have a seperate ...
10
votes
7answers
13k views

Do you use postfix or qmail and why [closed]

I am setting up a server and I have the choice of installing qmail or postfix. Can someone help me make the right choice. Thing I like to see covered are: - Performance - Ease of setup - ...
10
votes
1answer
474 views

Benefits to having a sole email VPS server

I have around 5 websites hosted in a VPS server, and for some reason I bought another VPS server recently just to host the emails for those 5 websites. I would like to know the pros and cons of having ...
9
votes
15answers
13k views

How to determine a reasonable attachment size limit?

I'll confess this is an area where I'll give it 10-20mb and toss out an "email is not intended for file transfer" whenever a user gripes about having to use FTP. But a shiny new mail server deserves ...
8
votes
5answers
1k views

Using gmail as your primary mail server

I have read that there is an option of using Gmail as your primary mail server. In the sense that you can add mx records etc and you do not have to do it on your own server. Do you think this is a ...
8
votes
5answers
1k views

Setting up an Email Server on Ubuntu

What are some of the Dos and Don't to setting up an email server on Ubuntu? Are there any gotcha's?
8
votes
2answers
4k views

How can I query postfix to test is an address is in the virtual address file?

Is there something I can run from the command line that will let me query postfix (running locally)? if an address is in the virtual address file and, where the mail for that address is routed to. ...
8
votes
1answer
2k views

Sending emails on behalf of my clients. The options

I wanted to know the best way to make my mailserver send emails on behalf of my clients' domains, without being greylisted and also avoiding bounce problems. I've been reading some other questions ...
7
votes
3answers
545 views

Do you run antivirus in mail server?

Considering a normal e-mail volume (I don't know how can I define that) of 10000 users in a mail server does it make sense to scan emails for viruses? I guess it should affect the server load but in ...
7
votes
4answers
2k views

In the mail header, what does the “received from” ip refer to?

I noticed that some mail header contact a field called received : from and it contains an ip address. Does this address refer to the sender machine even if he is using a web interface or to the ...
7
votes
1answer
1k views

I need advices: small memory footprint linux mail server with spam filtering

I have a VPS which is originally destined to be a webserver but some minimal mail capabilities are needed to be deployed as well, including sending and receiving as standalone server. The current ...
6
votes
3answers
799 views

What are the typical methods used to scale up/out email storage servers?

What I've tried: I have two email storage architectures. Old and new. Old: courier-imapds on several (18+) 1TB-storage servers. If one of them show signs of running out of disk space, we migrate ...
6
votes
1answer
2k views

How can I see the contents of the mail who's ID I get from mailq command?

I used mailq command and I got a line like for example: A705238B4C 603953 Wed May 23 11:09:58 apache@myserver.com So, now I'm wondering is there a way where I can "read" an actual content of the ...
6
votes
2answers
946 views

What settings should my email server be mindful of to avoid bounce back from major email providers?

So I think my postfix+dovecot+roundcube+postfixadmin+sasl+spamassassin+amavisd-new+postgrey setup is working correctly. I can send out emails to certain domain names. Receiving definitely works; ...
6
votes
1answer
105 views

Should I listen for SMTP on both 25 and 587?

I was setting up haraka as our mailing server, and for outbound email, it suggests moving to port 587 for SMTPS auth support. However, I'm unsure if I should be running 2 instances of haraka on ...
6
votes
3answers
2k views

saslauthd using too much memory

Woke up today to see my site slow/unresponsive. Pulled up top and it looks like a ton of saslauthd processes have spun up using about 64m of RAM each, causing the machine to enter swap space. I've ...
6
votes
2answers
916 views

Expose IIS SMTP Pickup folder as a file share - bad idea?

Environment: IIS Web Farm 5 servers Windows Server 2008 R2 IIS 7.5 ASP.NET 3.5 and 4.0 web application Our web app, like many, needs to send mail. Send only, no receiving. In the past, we've ...
6
votes
1answer
126 views

Freebsd jail for an small company - checklist - what shouldn't forget

Looking for an checklist for an "small company freebsd/jail server". Having pretty common starting point: FreeBSD jail (remote/headless) for the company: public web, email, ftp server, and private ...
6
votes
2answers
594 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 ...
6
votes
4answers
3k views

Minimal setup for sendmail to send outgoing email only?

I run a simple server that I administrate remotely, and I need it to be able to send an email to my personal email address every time an error occurs. With the default setup on Ubuntu, sendmail just ...
5
votes
8answers
4k views

How do I add outbound only mail service for local tools to a 'minimal' debian system?

I have several servers running applications on debian. Each has the packages it requires for the application, and no more. Currently, none have mail sending capability. However, I would like the ...
5
votes
1answer
306 views

How can you test a backup / secondary MX server?

I'm wanting to set up a secondary MX server using Postfix but I am wondering what is the best way to test this prior to putting into production (by adding its MX entry)? One possible way is to test ...
5
votes
3answers
3k views

Identifying which MTA is running

I dont have knowledge on linux and how can i know which mail server is running on my linux box? Postfix/Exim? Btw Didn't found postfix folder in etc/, where can i find master.cf? .Any idea for modify ...
5
votes
1answer
588 views

Lightest weight IMAP/POP3 server [closed]

I'm looking for an extremely lightweight mail server to handle IMAP/POP3 connections. Maildir backend preferably, with multiple authentication modes (SQL, LDAP, etc). Any suggestions?
5
votes
5answers
2k 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
2answers
11k views

How to collect bounces in postfix

This is related to this question: http://serverfault.com/questions/20550/ways-to-get-a-bounceback-report-for-my-newsletter-application Let's say I'm generating email addresses like this when I send ...
5
votes
3answers
1k views

Setting up a postfix email server

When I set up an email server using postfix on ubuntu server, how do I make sure that it won't be an open relay??
5
votes
6answers
7k views

Emails going to Junk for Hotmail recipients

We send daily mass emails to our customers (~30,000+ emails per day). We have problems with Hotmail users receiving our emails. Sometimes the email goes to the Junk folder, but often it will got to ...
5
votes
4answers
245 views

Copying/syncing email from a live server over network

The scenario is as follows: Copying and then syncing from a live mail server via network(only) to another server. The mail server is live meaning that lots of files (mails) are being altered, ...
5
votes
2answers
599 views

How do I get Postfix to deliver ALL mail to a custom script?

I am trying to configure postfix so that ALL mail that arrives (to any domain) is piped into a shell script that I have. I have tried several things, including setting mailbox_command = ...
5
votes
1answer
218 views

How to use two mail servers in parallel, if possible?

I basically want to have two separate email servers. The first one is the GoogleApps GMail service, which is for humans to use. The second server would be for sending messages from my application (so, ...
5
votes
2answers
2k views

Using Mac OS X Server e-mail and calendering

I'd love some feedback from folks on using the e-mail server and calendering features of Mac OS X Leopard server. How well has the e-mail server worked for you? Can you get your e-mail on a variety ...
5
votes
1answer
272 views

saslauthd multi instance for postfix smtp authentication

I have mail server Postfix+Saslauth. I configure multiple instance for Postfix: postfix postfix-out and two instances for saslauth: saslauthd saslauthd-out Setting saslauthd is ...
5
votes
3answers
4k views

Why does gmail flag my server emails as spam?

I recently moved my server to a new slice at slicehost and since, gmail has been flagging my email as spam. I have added domain keys, created a SPF record, have reverse dns setup, and my ip is not ...
4
votes
5answers
5k views

Open source mail server able to manage large mailboxes accessed via IMAP? [closed]

I'm looking for a open source mail server based on Linux to replace an existing Exchange mail server (Windows Server 2003) with several (5-10) large mailboxes (each with more than 2 Gbytes in size or ...
4
votes
5answers
2k views

How do I move my website to a new server without interruption to email?

I have a corporate website on a server that also hosts all our email. I have no idea how diligent all the employees have been about backing up their email / leaving old messages on the server, etc. In ...
4
votes
1answer
144 views

SPF records issue

I have an SPF record set up for my domain eg: v=spf1 a mx include:mydomain.co.uk ?all However, I now have to add an SPF record for a web based invoicing system which wants me to add the following ...
4
votes
2answers
8k views

Minimum PostFix configuration for sending emails only?

My servers are currently on sendmail which is not very efficient. I'd like to migrate to PostFix. I'm using Google Mail for Domain for handling incoming email so I need to setup PostFix to send ...
4
votes
4answers
2k 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 ...
4
votes
4answers
8k views

how to find out where email is being hosted for a website

Is there a whois equivalent to find out the hosting details for email?
4
votes
2answers
1k views

Postfix: content-filter vs. milter

I have a Postfix mailserver with content filtering using AMaViS via the "content-filter" option of Postfix. Now I wonder whether it would be better to use AMaViS as a milter instead of the ...
4
votes
3answers
1k views

What's the largest message size modern email systems generally support?

I know that Yahoo and Google mail support 25MB email attachments. I have an idea from somewhere that 10MB email messages are generally supported by modern email systems. So if I'm sending an email ...