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

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203 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 ...
5
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1answer
544 views

How can I proactively detect compromised Exchange 2010 accounts?

We have had issues with compromised Exchange accounts sending out malicious e-mails via SMTP and OWA. It seems that many of these accounts were compromised via incoming phishing attempts. We are ...
5
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1answer
3k views

modify the recipient address of an email on the file in the postfix queue

I have a few emails in my mailq which are bounced for a good reason, the email address is wrong. I was wondering if it is possible to modify the address of the recipient on the fly. I can see the ...
5
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1answer
450 views

Postfix SMTP sends to localhost, ignores MX records set to Google Apps

I have the MX records for zaltin.com set to the Google Apps domains (aspmx.l.google.com etc.). If an email is sent to kerrick@zaltin.com from most places, it goes to my Google Apps account. However, ...
5
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1answer
450 views

Adding QR Codes to Exclaimer

We are running a piece of software called Exclaimer which sets a standard template for email signatures and grabs some details from Active directory, like Contact numbers and title. I need to add a ...
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4answers
5k views

Low disk space email alert

Very simply I am trying to trigger an email alert from a Windows 2003 server to tell me when the disk space is low. Has anyone had experience with setting this up? Thank you.
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2answers
4k views

Disabling Specific Options in Outlook 2010 through Group Policy?

Alright, all research thus far has failed me, this must be a somewhat obscure problem. I think I am close but I need an answer as to whether or not what I am trying to do is possible so I don't waste ...
5
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1answer
57 views

MS Exchange — running code against outbound email

I would like to know if using MS Exchange there is a way to run code against outbound emails. The code would need to trigger on emails sent to a specific domain, connect to a database, check for an ...
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2answers
2k views

What are the advantages of DKIM?

After making my server sign outgoing email I started to wonder what the benefits are. This is the opposite of a previously asked question. Naively I see two benefits: We can throw away all emails ...
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4answers
2k views

How do you test a new email filtering system?

What method do you use to test or evaluate potential new email filtering systems before you set it up on your production network? I am particularly interested in methods that are appropriate for ...
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1answer
270 views

I think installing PostFix solved my issues, but it seemed *too* easy

This is a followup to a serverfault post I made a while ago: http://serverfault.com/questions/21633/how-do-i-target-a-different-mail-server-depending-on-domain-with-exim (More context here too: ...
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1answer
75 views

Postfix: selecting relay host based on From: mail header rather than envelope sender

I've successfully set Postfix to relay emails via Mandrill using SASL and sender_dependent_relayhost_maps with a MySQL table so that different senders connect to Mandrill using their own Mandrill ...
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1answer
462 views

Is there an RFC or standard for “Envelope Journaling”?

Is there a formal standard defined for Envelope Journaling (or BCC journaling)? I'm a software developer, and want to make sure I implement the journaling consumer correctly. My model for reference ...
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3answers
551 views

What is the best way to setup a mail server in this day and age? [closed]

I am setting up a fresh brand new mail server and I want to get it whitelisted across all mail companies, aol, yahoo, hotmail, gmail, etc. There are options like mailgun.net which I would consider ...
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3answers
475 views

Clean up an opt-in email address list

We have a client that has an email marketing list of about 50k contacts that have at some point opted in to their mailing list. They haven't used the list for a while and on their last campaign got a ...
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5answers
883 views

SMTP server, SPF records, domainkeys

Recently we have setup a new SMTP server to send newsletters and promotional mails to our registered users. There are 5000 users who will receive newsletters on weekly basis. We are getting bounced ...
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3answers
4k 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 ...
5
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2answers
2k 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 ...
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6answers
3k views

What's your maximum email message size, and what do you do for bigger files?

As the subject says... We're using Exchange 2007 and (mostly) Outlook 2003 and have a limit of 20MB. For larger files, we have an ftp server that people inside can easily copy files to or from, and ...
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1answer
127 views

Postfix stops picking up mails at night

Our postfix system stops sending mails at night. Every night at 2am it stops picking up mails. The server is a monitoring server, which sends a lot of mails per day. /bin/mail drops the mails in the ...
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2answers
76 views

Strange non-delivery behavior with Office 365 Hosted Exchange

This is such an odd issue it's difficult to describe, so please bear with me. I have a client (kirby@jibberish.com) who has purchased Hosted Exchange services from Rackspace. He has no problems ...
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2answers
196 views

How to configure Postfix to only send out emails with a certain header?

I'm setting up a local development VM and I was able to redirect all sent out emails to a local mailbox using virtual_alias_maps with the entry /.*/ username. What I'd like to add is an option to not ...
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3answers
160 views

Linux monitor email processing live

Is there an application that can link all the mail processing steps together from connection to delivery in a way that shows the whole process and the decision live? I know it's possible to tail -f ...
5
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1answer
356 views

Speeding up Outlook Express on Windows XP over satellite

My brother is in the field with Doctors Without Borders. I'm posting this question on his behalf. We use outlook express (on a pc running windows XP) and a 9600 baud dial up satellite phone modem ...
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votes
1answer
1k 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 ...
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3answers
11k views

Mailbox unavailable, client does not have permissions to send as this sender - only the first time

Our users can send emails from our ASP.NET Web application on the click of a button. In our testing environment, there is a strange thing going on. The first time the application tries to send the ...
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1answer
896 views

Sendmail Tuning For Batch Mail Jobs

I have a webservers that send out emails to a sendmail relay server as a batch job. The emails need to be accepted by the relay sendmail server as fast as possible, however, they do not need to go out ...
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2answers
2k views

How to make Exchange 2010 use In-Reply-To and References headers as well as Thread-Index?

The problem that I have is simple. We have recently upgraded from Exchange 2003 to Exchange 2010. Everything went fine, and there are very few complaints. In Exchange 2003, some of our OWA users liked ...
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4answers
623 views

Does SQL Server Database Mail use threads while sending mail?

We are using SQL Server 2008 Database Mail to send emails to our website visitors. I don't know whether SQL Server sends mail one by one by picking up from the queue or it will use threads to send ...
5
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1answer
52 views

Is Exchange 2010 compliant with RFC 3848

I have looked up Exchange 2010 Support for RFC Standards but do not see RFC 3848 amongst the supported standards. I do see RFC 4954 listed, which 'recommends use of RFC 3848 transmission types', ...
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1answer
2k views

How to deal with mass out of office / company closure

We have a 4 day weekend coming up soon and it has been suggested that all turn out of office assistant on to ensure all customers are aware we are closed. Due to end user reliability and stupidity i ...
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votes
3answers
5k 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 ...
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1answer
551 views

Working around Gmail mailing-list “feature.”

We're using Google Apps for our domain's e-mail via IMAP. Whenever mail is sent to a mailing list, copies of the original mail are not received in inboxes. According to Google, this is a "feature." ...
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3answers
13k views

How to get around Outlook/Exchange's Rules and Alerts 32KB limit?

I use Outlook's Rules and Alerts facility to automatically file my emails. I find it a great time saver. However, I've recently been unable to add further rules - Outlook suggests that there is ...
5
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1answer
398 views

Disable Outlook Web Access Junk filtering in Exchange 2013

By default, Outlook Web Access (OWA) in Exchange 2013 seems to move suspected junk mail to the Junk Email folder. This is undesirable behavior in most of my environments because we have Barracuda Spam ...
5
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0answers
458 views

Export GFI MailArchiver e-mails for import into Exchange 2010 SP1 Personal Archiving

We have an existing installation of GFI MailArchiver 5 with several databases of archives (perhaps 100-150GB). The goal is to export each user's archived e-mail and then import it into Exchange 2010 ...
5
votes
2answers
987 views

OSX 10.6 integration into NIS/netgroup/automount infrastructure

I have an existing infrastructure where accounts are maintained under NIS (yp) with no local unix accounts. Also, all the standard maps including hosts, mail aliases, netgroups, etc...are maintained ...
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6answers
880 views

Are SPF needed for domains that do not send mails and do not have MX record?

I have some domains registered that do not send mails. I have totally removed MX record for these domains on my DNS. Is it still useful to set an SPF record in order to avoid spammer to send mails ...
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votes
3answers
19k views

Easiest way to send an Email from the command line, using windows 2003 R2

I have a Windows 2003 R2 server and I want to send an email from the command line. This server does not have the SMTP service configured. Is there a one liner that will let me send an email? My ...
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5answers
1k views

Is there any point in running SSL and encryption for email?

Sorry if this is a stupid question, I'm curious what the difference between the two is if any. Is there any point in running SSL and encryption for email? Or, is one method of security good enough?
4
votes
1answer
397 views

Replacing an MX record with a CNAME that doesn't match the hostname

Today we have 5 companies that all use Google for email services example1.com. 3w IN MX 10 mail.Google.com. example2.com. 3w IN MX 10 mail.Google.com. ...
4
votes
3answers
201 views

Email going to a user at a similar domain name

I guess this is more of a best practice/policy question. I'm the postmaster for example.net. Another company has example.com. I get the catch-all emails, any email that doesn't have a user account on ...
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3answers
961 views

What's the difference between POP3 and IMAP for e-mail?

How does IMAP differ from POP3 and what are the pros/cons of each and why choose one over another?
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2answers
129 views

Retrieving mail that was sent when didn't have MX records

I currently point a domain to a server using an A record but I don't have MX records set up. Is there a way to still get mail that failed to send to email addresses that use this domain?
4
votes
2answers
102 views

In SMTP, how does one choose between “Accept than Bounce” vs “Bounce at the edge”?

There seems to be a variety of implementations of SMTP that either immediately reject a message, and others that do an accept, then bounce the message. Operationally, the accept-than-bounce is a ...
4
votes
3answers
23k views

Display number of messages in linux mail queue

Is there a simple command to find out the current number of messages in the linux mail queue? mailq dumps out a verbose list, but it's not convenient for a quick overview. I'm using Ubuntu and ...
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7answers
757 views

Good tool for searching E-Mail in Outlook? [closed]

As a System Administrator, I tend to accumulate a lot of E-Mail. And, unfortunately, my current employer requires Windows on the desktop and Outlook for e-mail. My question is, are there any good ...
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8answers
4k views

How could one archive all emails sent from employees?

My client runs a small business. This business has a small number of employees. They are currently hosted through GoDaddy for web and email. For legal reasons the client would like to archive emails ...
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6answers
3k views

Send email on behalf of clients

We're a communications company primarily doing printing of statements / utility bills, then mailing them out in the post. A few clients have asked for e-Delivery. Pretty much take the print output as ...
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3answers
401 views

Why is my computer sending emails

I am currently using Debian Squeeze 6.0. The administrator of my work place receives every week messages from several processes of my system: cron smartd ... The messages are send to ...