learning mail relay

I am adding email service to our ISPConfig (v2.2.27, I think, running on Ubuntu 8.04.1 LTS.) I studied the thread 'ISPConfig & Nameserver' and my users can receive emails correctly. Because I am on a dynamic ip address, I followed Falko's 'Set Up Postfix For Relaying Emails Through Another Mailserver.'

Our ISP provider allows ten no charge email address per account and I have setup an email account called 'mailrelay@blah-blah(dot)net' for use as the relay account. While setting up the account, their support instruction specifically allows 250 email relays. I am assuming that this should be plenty as there are only seven users total on our email server.

Sorry for length of background info. During testing, I discovered that I had mis-typed one command line instruction. I returned to that command and simply re-entered the correct instructions. I believe I am correct when I say that the second string of commands simply overwrite the old info and that I do not have to delete (for example) the '/etc/postfix/sasl_passwd' file prior to entering new commands? Or does this second string of commands append to existing files?

We are having trouble sending emails from the ISPConfig server to the world. Sending email between users works fine. I have confirmed that the relay email account I setup can send emails.

Searching the forums has left me confused.

I am still learning nameserver and there settings, so it could be that I have misinterpreted the 'ISPConfig & Nameserver' thread. Part way through the thread, the ISP and DNS reference names changed from the beginning of the thread and I think I got confused as to which was the domain registrar and which was the dynamic dns service address. But, if I can receive emails, I think I have that all set correctly?

Please help me correct my sending email problem.

 

mail relay and receive now not working

Thanks, Till for your response. I did as you instructed so that is corrected.

This morning I have discovered that I am no longer receiving any email from the outside world, as I had yesterday morning.

I am going to "get into" all my dns settings as they have to be set incorrectly, somehow.

As these issues may be unrelated to ISPConfig, I am going to review my dns settings with my dynamic dns service provider and my domain name registrar to determine correctness and not burden this forum with what very likely are my mistakes.

Please cost this thread for now.

 

if I'm not mistaken it's a hash file. So when you altered saslpasswd you need to postmap it before it takes effect.

 

You are correct: postmap /etc/postfix/sasl_passwd will do the trick. After doing this check that a .db file has been generated by doing an ls -al /etc/postfix.

You should see both files: sasl_passwd and sasl_passwd.db

And just to be redundant because I spent the last week dealing with this issue be sure to put the proper lines in the main.cf file.

relayhost = [your isp's smtp.mail.domain] : (alternate port if 25 is blocked)
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd

Good luck!

 

I am closing this thread for now

If it is okay with everyone, I am closing this thread for now.

I am having dns issues that are quite honestly my mistake and I am going to correct my error before I move forward.

And, yes, you are correct, after deleting and then creating new /etc/postfix/sasl_passwd one should again run postmap to convert the file into postfix usable db file.