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

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How to use sniffer to troubleshoot SMTP traffic?

We're having an issue where we are no longer receiving external emails. (We have an Exchange mail system, with a Barracuda spam filter and Watchguard hardware firewall.) The problem is that mail ...
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15answers
1k views

Managing huge mailboxes

I'm running an Exchange 2000 server, with only a few users (around 10). Some of them manage all of their whole work in email. They often send/get documents several megabytes large, and send/receive ...
4
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3answers
387 views

With regard to anti-spam practices, what exactly does a typical reverse DNS check look for?

My understanding is that a typical reverse DNS lookup will compare the SMTP hostname (provided in the EHLO/HELO command) of an incoming connection and verify that it matches the PTR record for the ...
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3answers
1k views

Postfix 'load balance' sending IPs

I got a server with 8 IP addresses to use as a mail server (With PostFix). I want PostFix to rotate the IP and hostname for each message. I found the config parameter smtp_bind_address = 1.2.3.4 ...
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2answers
176 views

Unknown MX records. Help!

I am using the spf record creator at http://www.openspf.org/ and it's telling me we have 14 mx records. This is not right. We use google apps for our email and when I check our host records it is ...
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3answers
5k 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 ...
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2answers
2k 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 ...
4
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3answers
2k views

How can i send /var/mail/root again?

Through some missconfiguration i've a lot of emails in /var/mail/root and /var/mail/www-data How can i "loop" over these files and send each mail another time? Thanks in advance!
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1answer
868 views

Hotmail and Gmail mark emails as spam [duplicate]

Possible Duplicate: How to send emails and avoid them being classified as spam I have been developing a PHP application and one of the features in that application is the ability to send ...
4
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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 ...
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3answers
2k views

Where are sendmail emails stored?

I am trying to build an autoresponder script for sendmail (no, I don't want to use a pre-built one yet), but I can't seem to find the location of received emails on my server. I have to specify that ...
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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 ...
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2answers
9k views

Get log of mail sent with mail() from PHP (sendmail?)

After some server changes our PHP configuration got nuked, which caused a client's large mailing list to time out partially through about 4,000 addresses or more. We want to avoid sending a duplicate ...
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5answers
5k views

Migrate IMAP account between providers - client access only

I have an IMAP E-Mail account with my old provider. I have a new, empty IMAP account with the new provider. Is there a tool or Thunderbird to migrate the E-Mail data from one account to another? I'm ...
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4answers
114 views

Would an Exchange Server be appropriate for this situation?

I've just started volunteering at a local organisation and I've been asked to come up with a solution to the following problem. However, networking is hardly my forte so I thought I'd ask here before ...
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3answers
121 views

Spam received to mystery “users” email group

This morning, our entire company received a spam message sent to users@ourdomain.on.ca, where ourdomain.on.ca is our actual domain. There is a distinguished name that this could correspond to: ...
4
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3answers
378 views

With valid SPF my mail header becomes huge -> high spamassasin score

I have a dedicated server with a survey system running on a subdomain. The parent domain is hosted on another server. I send email via google apps. Reverse DNS is correct. Without SPF og DKIM, the ...
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5answers
187 views

Securing Internet and E-mail in small corporate environment

Our company is having a real problem with spam, phishing, and sophisticated viruses (ones that are brand new at time of first download, and not recognized by any virus scanners for at least a few ...
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3answers
8k views

Why is my SPF Record not working?

A spammer is using my domain to send spam, and I'm receiving a large amount of bounced email. I have an SPF record on the domain, however it doesn't appear to be having any effect. Receiving MTA's ...
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7answers
1k views

Receive email alerts from Linux file server

GOAL: Get a text file on my file server into my gmail inbox. The file server is running Ubuntu Server 8.04 I currently SSH into it from time to time and to check logs, SMART stats for hard drives, ...
4
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3answers
2k views

How can I remove a trac user's e-mail address?

We have some users that have left the company and we have suspended their e-mail address, but trac continues to send notifications to these addresses. How can I remove the e-mail address from their ...
4
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1answer
1k 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 ...
4
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2answers
218 views

Running a mail forwarding service, what are some steps I should take to prevent my IPs being blacklisted

Background: I'm about to launch a service which offers email forwarding for a large number of domains. Say you want people to be able to contact you using you@somesite.com, all emails sent to that ...
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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 ...
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2answers
8k views

Postfix can't receive external mail

Im trying to setup a mail server to receive email and I am working with Postfix on an Ubuntu EC2 instance with an Elastic IP and the reverse DNS Lookup points to my domain. I am able to send and ...
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6answers
8k views

How to send Bulk email with SMTP server

How do email marketers get success while sending mails? Though their emails volume is very high, they can deliver mails with out any problem like spam or bounce. If we try to send bulk mails with our ...
4
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3answers
7k views

How do I temporarily suspend mail delivery to a specific domain (non-local) with Postfix?

Using Postfix and custom transports I can manage delivery speeds depending on the recipient's domain. (For example, I send max one message per second to *@hotmail.com) I also use similar rules to ...
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3answers
6k views

Send As Distribution Group Email Address?

We have a Small Business Server 2003, with a support distribution group. Is it possible to allow members of a distribution group, send emails from the group email address?
4
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3answers
68 views

Will mailing lists “break” if SPF is too restrictive?

I have recently configured my own mail server (Linux-based postfix + dovecot scenario). This is just for personal use - I have no bulk mail going out, no automatically generated mail outbound from the ...
4
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3answers
573 views

A way for DNS record to say “this domain has no mail server”?

What is the appropriate way to set up a DNS record that says "this domain has no mail server"? I assume I need a special MX record to do this, otherwise it will be assumed that the A record is the ...
4
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1answer
169 views

Does the MTA (Postfix, Exim, etc.) get installed seperate from the mail server

I'm new to mail servers and still trying to understand all the components. What I read is that there are many MTAs, but the 4 common ones are qmail, Postfix, Sendmail, and Exim. I also found this ...
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2answers
2k views

Does the presence of a Content-ID header in an email MIME mean that the attachment must be embedded?

Two different third-party email products we have are reacting differently to the presence of a content-id header in the MIME source of an email. This is resulting in an inconsistent user experience ...
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3answers
4k views

What is the easiest way to setup a linux server to send mail?

I'm just about finished setting up the basics of my new ubuntu server - I don't have very much experience with Linux. I only need to be able to send email from my server - but it seems to be really ...
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2answers
2k views

Custom headers in Email lost?

I have some questions about custom mail headers Does anybody know of any mailserver which deletes proprietary/custom headers when being transmitted to its destination? Is there a header you can set ...
4
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2answers
3k views

Google Apps email forwarding from non-existing email addresses

We're planning to move all our corporate email to Google Apps, but I couldn't find an answer for the following question anywhere. Hope anybody will help. Currently we have 10 real email addresses ...
4
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1answer
827 views

Moving mail server to google apps

I just recently moved one of my Mail server (Exim+dovecot) to google apps thinking it would be a good idea. I am interested to hear what the serverfault community think about it, and mostly weight the ...
4
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1answer
4k views

How does Outlook identify “Extra Line Breaks”

I am writing a script that emails the output to me, and I read it in Outlook. For some reason Outlook removes all the line breaks in the message, and gives me a little notice that it has removed the ...
4
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1answer
66 views

Where is the email bounce sent? To the @domain or to the IP that sent it?

When I send an email from noreply@mysite.com to user@yahoo.com and I use that VERP bounce format like bounce+user=yahoo.com@mysite.com Is this bounce back sent to the mail server in DNS records of ...
4
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2answers
120 views

How do I track down what email address is causing the non-delivery?

I work for a local government agency where we manage our own mailing list for pushing out news and information for our citizens. I try to stay proactive on removing email addresses that no longer ...
4
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1answer
289 views

What encoding is used for non English languages in an email subject?

I'm writing a specification that essentially requires ASCII characters in an email message. I do recall that an email message can have a subject encoded in a foreign language, however I don't know ...
4
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1answer
77 views

How to handle many daily emails from cron efficiently?

With each new server comes at least one more daily crontab email. The FreeBSD servers even send two: a daily and a security run output. Thanks to my obsession with virtualisation the number of emails ...
4
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6answers
960 views

Email Deliverability on Yahoo is very poor. Any suggestions please?

All other ISPs (Google, AOL, Hotmail) are fantastic, hitting 98-100% in the inbox. Yahoo is very random, and lately our deliverability has dropped drastically. All IPs are senders certified by Return ...
4
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6answers
3k views

email output of powershell script

I found this wonderful script that outputs the status of the current DFS backlog to the powershell console. This works great, but I need the script to email me so I can schedule it to run nightly. I ...
4
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2answers
837 views

Scalable way to add users in Postfix without creating new unix/linux accounts?

What is the most scalable way to add new users in postfix? I don't necessarily want to create a new user in /etc/shadow just for email. I know I can use aliases but this does not solve the issue of ...
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3answers
1k views

How can I setup Postfix to deliver a mail to multiple local users as a copy?

Is it possible for Postfix (on FC7) to recieve an email at a@example.com and automatically forward a copy to b@example.com and c@example.com and d@example.com? I can't use .forward files because this ...
4
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1answer
266 views

Other cases similar to the 500 mile email problem?

The case of the 500-mile email is a pretty odd case with a fun fix. Can you share other stories where the actual fault was something unexpected. Perhaps it can help others who have some strange ...
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3answers
4k views

uuencoded mail attachments display as binary code

I have run into a attachment display issue at a client who has recently switched from Exchange 2003 to Exchange 2010. The issue was initially perceived as affecting only Mac OS X email clients ...
4
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1answer
2k views

Exchange 2010: Giving a user calendar-viewing access without e-mail access

We want to give a User A access to view User B's shared calendar without giving user A a mailbox on the Exchange instance. User A will have a mailbox in another non-Exchange server in our network. ...
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3answers
14k views

How to set up email alias in exchange 2010

I have a couple users who need multiple email addresses (alias) forwarded to their accounts but setting up a separate user and forwarding the email is showing the email to the users main address ...
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3answers
211 views

Keeping emails in Web app test environment from getting out

We have a test environment which is pretty much a copy of the production environment for our Web applications. In the past email addresses of customer data were scrubbed to avoid emails from test ...