OK this is my problem:

I have a domain name, lets call it my_domain.com.
Untill couple of hours ago, I thought I had my own mail server running (I have name server at zoneedit.com, MX record set up etc.) I know for a fact that my sendmail was up and running, althought I didn't play with its config at all.

I was sending mail from pine and Kmail, and it was arriving to the destination as

user@my_domain.com.

I was receiving mail too, no trouble.

However, when I sent an email from MUTT (uncofigured, "out the box") it arrived as

user@my_domain.hsd1.ca.comcast.net (Comcast is my ISP)

Obviously, it was sent from my ISP's mail server. So, have I been sending through their mail server all along? Or is pine using my own mail server and mutt is using the ISP's? Why would mutt go out to look for mail server somewhere else? What's going on? Is that too many questions?

There was a fair few questions there!

What I would do is to send an email from a seperate account such as gmail to your home email address. This gives you a datum point where you know everything is the same - it might actually be better using a work email if they are running their own email and only have one server!
Then send another to your ISP email address i.e. you@my_domain and you@yourproperemailaddress and check the headers.

then do this in reverse i.e. back to the gmail account.

This should at least give you some kind of logs to be able to work out if and what the problem is.
Once you work out if one is set up differently, you can then start looking at fixing it -

its easier doing this that looking over config files before you really know what the problem might be!

hope this helps a little

F0ul Oli

yeah i've been doing that all along. i put it all in my first message. everything that i wrote i found from headers.

i don't understand what do you mean by
you@yourpropermailaddress ?

If you want to verify which MTA was used for delivery (yours or your ISP's), then check /var/log/maillog. The "relay=" entry should tell you which MTA was selected by sendmail for delivery.

scowles,
thanks, that helps quite a bit. it turns out that i really was using my own server from pine and theirs from mutt.

maybe there is a mutt user around to explain default config of mutt, why does it go look for another server.

you are using a computer that was automatically configured using your ISP´s DHCP (or whatever they use) as your mail server. What was tacked onto the end of your address is typical of the types of names that they automatically assign to you. You might try going into your network configuration, and setting things up again with the domain name that YOU have chosen entered in by you- then when your computer gets it´s IP from your ISP, it won´t be looking for all of that garbage that they will tack onto the end as you have already specified this information

BTW domain is whatever comes after the LAST period in your first tier of addressing ie myemail@www.blablabla.DOMAIN