I, with some help, installed Postfix, Dovecot and MySQL on a Linode cloud server running CentOS 6.

I can send email from my gmail account to joe@MYDOMAIN.COM. I can't send email from joe@MYDOMAIN.COM to a valid email address.

Since I can successfully send emails to joe@MYDOMAIN.COM, I am guessing that I don't have a dns problem but rather a Postfix or Dovecot configuration error.

The following line is from my /var/log/mail.

Nov 6 04:21:26 mail postfix/smtpd[3302]: NOQUEUE: reject: RCPT from c-24-118-254-66.hsd1.mn.comcast.net[24.118.254.66]: 450 4.1.8 <joe@AsusLaptop.hsd1.mn.comcast.net>: Sender address rejected: Domain not found; from=<joe@AsusLaptop.hsd1.mn.comcast.net> to=<joe@MYDOMAIN.COM> proto=ESMTP helo=<AsusLaptop.hsd1.mn.comcast.net>

The comcast.net stuff above is my ISP and I am sending the email from a laptop behind a router.

Any help would be appreciated.

Not sure. I'd be able to tell you more if you included more information.

...

http://www.openspf.org/Tools



After, please post the resulting diagnostic / header / log information here, it would make things easier to troubleshoot.

Do you want to see more of /var/log/maillog?

Sure. That, and/or anything you have related to the SPF testing.

Take my advice with a grain of salt, but that looks like you were sending an email to joe@mydomain.com not from there, and your server rejected it because it could not find the domain AsusLaptop.hsd1.mn.comcast.net.

The actual domain name would really help the folks here.

_________________
--
Chris Bryant

What I want to do is send and receive email from joe@MYDOMAIN.COM just like I send and receive email from a gmail account.

I can send emails to joe@MYDOMAIN.COM from my gmail account. I use Thunderbird to send the message. I easily read the email with mutt. I can't read the email with Thunderbird since the latest release of Thunderbird can't be configured to work with mail.MYDOMAIN.com and self-signed certificates. Just for the record, I read the email with:
$ mutt -f imaps://joe@MYDOMAIN.COM@mail.MYDOMAIN.COM

The problem is that I can't send emails so they come from joe@MYDOMAIN and go to my gmail account. I try to do this with mutt and the following line in .muttrc.
set smtp_url="smtp://joe@MYDOMAIN.COM@mail.MYDOMAIN.COM"
When I try to send an email to my gmail account, I am prompted for a password and then I get the error message:
"SMTP session failed: 450 4.1.8 <joe@AsusLaptop.hsd1.mn.comcast.net>: Sender address rejected: Domain not found"
The comcast.net stuff above is from my ISP and I am using a laptop behind a router.

Here are the entries in /var/log/maillog dealing with sending email from joe@MYDOMAIN.COM.

Nov 6 04:21:04 mail postfix/anvil[3241]: statistics: max connection rate 1/60s for (smtp:209.85.223.174) at Nov 6 04:17:10
Nov 6 04:21:04 mail postfix/anvil[3241]: statistics: max connection count 1 for (smtp:209.85.223.174) at Nov 6 04:17:10
Nov 6 04:21:04 mail postfix/anvil[3241]: statistics: max cache size 1 at Nov 6 04:17:10
Nov 6 04:21:21 mail postfix/smtpd[3302]: warning: dict_nis_init: NIS domain name not set - NIS lookups disabled
Nov 6 04:21:21 mail postfix/smtpd[3302]: connect from c-24-118-254-66.hsd1.mn.comcast.net[24.118.254.66]
Nov 6 04:21:26 mail dovecot: auth: mysql: Connected to 127.0.0.1 (mail)
Nov 6 04:21:26 mail postfix/smtpd[3302]: NOQUEUE: reject: RCPT from c-24-118-254-66.hsd1.mn.comcast.net[24.118.254.66]: 450 4.1.8 <joe@AsusLaptop.hsd1.mn.comcast.net>: Sender address rejected: Domain not found; from=<joe@AsusLaptop.hsd1.mn.comcast.net> to=<joe@MYDOMAIN.COM> proto=ESMTP helo=<AsusLaptop.hsd1.mn.comcast.net>
Nov 6 04:21:26 mail postfix/smtpd[3302]: lost connection after RCPT from c-24-118-254-66.hsd1.mn.comcast.net[24.118.254.66]
Nov 6 04:21:26 mail postfix/smtpd[3302]: disconnect from c-24-118-254-66.hsd1.mn.comcast.net[24.118.254.66]
Nov 6 04:22:21 mail postfix/smtpd[3255]: timeout after END-OF-MESSAGE from localhost[127.0.0.1]
Nov 6 04:22:21 mail postfix/smtpd[3255]: disconnect from localhost[127.0.0.1]

What we want is for you to provide more information. Do you own 'MYDOMAIN.COM'?

OK, here it is. I hope nobody crashes it.
MYDOMAIN.COM is jhesse.com. I own it and it points to a Linode server.
I think the dns is ok.

Sounds like whatever email program you're using isn't setting a proper From: header.

I'm using "mutt". I don't think it has bugs.

You mean your e-mail address really is joe@AsusLaptop.hsd1.mn.comcast.net? Funny, a hostname lookup on "AsusLaptop.hsd1.mn.comcast.net" returns an invalid hostname for me (no IP address found for the hostname).

Your Linode server does these kinds of lookups to ensure a spammer doesn't use just any random, non-existent domain as the sender address (granted, you can configure your server to skip these checks, but I would recommend against that).

In essence you've configured your e-mail client (the one you're trying to send e-mail from) to use an invalid sender address, which is why the message is being rejected.

I happen to be using my Linux laptop where my user name is "joe", and the host name is "AsusLaptop" and my ISP info gets appended on.

I am only using my laptop for the email client software on the computer, mutt in this case. Think of running the Thunderbird email client on a laptop. You can send gmail from Thunderbird so it comes from the gmail SMTP server and goes to wherever you send it.

I want the same thing here with mutt as the email client. I want the email to come from my SMTP server and to go wherever I choose. I either am not using mutt properly or my SMTP is not configured properly.

http://support.google.com/a/bin/answer.py?hl=en&answer=33786



^There's a reason I suggested you try using the SPF checker...

If you're trying to test by sending an email to your gmail as a test, it's almost certainly guaranteed to bounce if your postfix server is sending out bogus email addresses without a valid SPF configuration.

Edited to add:

Technically, this text I'm quoting applies to google apps (email hosting using google as the provider) but my point was that the gmail / google mail servers will check SPF configuration when you send a mail to any google-hosted email address or domain.




Correct. You're not sending correctly (probably because mutt is configured wrong)

Would you mind posting the relevant section of your ~/.muttrc configuration file?

(minus the passwords, for obvious reasons.)

Edited again:

Actually, I think I already see your issue:

instead of:

set smtp_url="smtp://joe@MYDOMAIN.COM@mail.MYDOMAIN.COM"

try like this:

set smtp_pass=   your password goes here
set smtp_url = "smtp://mail.MYDOMAIN.COM"
set from="joe@MYDOMAIN.COM"
set realname="joe surname"

You can verify that Postfix is able to send outgoing mail with the following:

/usr/sbin/sendmail -t -i <<EOT
To: me@example.org
Subject: simple test

This is only a test.
EOT

Use an e-mail address that you or a friend control in the To: line.

If this works, it's just a matter of getting your e-mail client to properly submit mail.

Still no luck. The only redacted item below is my smtp_pass.

Contents of .muttrc

set smtp_pass="redacted"
set smtp_url="smtp://mail.jhesse.com"
set from="joe@jhesse.com"
set realname="joe hesse"

=============================

Error message from mutt

SMTP session failed: 554 5.7.1 <joehesse@gmail.com>: Relay access denied

=============================

Tail of /var/log/maillog

Nov 7 07:11:27 mail postfix/anvil[3637]: statistics: max connection rate 1/60s for (smtp:24.118.254.66) at Nov 7 07:08:05
Nov 7 07:11:27 mail postfix/anvil[3637]: statistics: max connection count 1 for (smtp:24.118.254.66) at Nov 7 07:08:05
Nov 7 07:11:27 mail postfix/anvil[3637]: statistics: max cache size 1 at Nov 7 07:08:05
Nov 7 07:17:58 mail postfix/smtpd[3684]: warning: dict_nis_init: NIS domain name not set - NIS lookups disabled
Nov 7 07:17:58 mail postfix/smtpd[3684]: connect from c-24-118-254-66.hsd1.mn.comcast.net[24.118.254.66]
Nov 7 07:18:00 mail postfix/smtpd[3684]: NOQUEUE: reject: RCPT from c-24-118-254-66.hsd1.mn.comcast.net[24.118.254.66]: 554 5.7.1 <joehesse@gmail.com>: Relay access denied; from=<joe@jhesse.com> to=<joehesse@gmail.com> proto=ESMTP helo=<AsusLaptop.hsd1.mn.comcast.net>
Nov 7 07:18:00 mail postfix/smtpd[3684]: lost connection after RCPT from c-24-118-254-66.hsd1.mn.comcast.net[24.118.254.66]
Nov 7 07:18:00 mail postfix/smtpd[3684]: disconnect from c-24-118-254-66.hsd1.mn.comcast.net[24.118.254.66]
Nov 7 07:21:20 mail postfix/anvil[3686]: statistics: max connection rate 1/60s for (smtp:24.118.254.66) at Nov 7 07:17:58
Nov 7 07:21:20 mail postfix/anvil[3686]: statistics: max connection count 1 for (smtp:24.118.254.66) at Nov 7 07:17:58
Nov 7 07:21:20 mail postfix/anvil[3686]: statistics: max cache size 1 at Nov 7 07:17:58