Now Postfix won't receive messages! :(

[PierreQuebec]

Greetings,

My Internet service was down for a few hours (problems with my ISP probably; I couldn't check as I was working outside) between about 07:15 and 14:45 UT today, and ever since it came back online, my Postfix server has been unable to receive messages.

My MX records seem to point to the right IP, my Postfix is up and running (even upgraded from 2.5.1-1 Ubuntu to 2.5.1-2 Debian because of a problem which I can't exactly recall about something like btree:/something) but messages sent to my addresses are simply floating around in limbo on the Internet.

When I tell my domain name registrar to instead forward any e-mail, for those addresses that would normally be under my Postfix's watch, to another e-mail address (for example my Hotmail one), then all e-mails are delivered without any problem.

Postfix 2.5.1-1 and now Postfix 2.5.1-2 on Ubuntu 7.10 Gutsy Gibbon
Domain names pierrepaquette.net (main) jetetrouve.com (virtual alias) cielprofond.info (virtual alias) and quebecscope.info (virtual alias)

How can I find what's wrong?

Thanks in advance,
Pierre

[PierreQuebec]

Now I'm wondering if I have been hacked or something!!! :-S

I tried again setting up my MX records to my current IP address, and then I sent myself an e-mail from my Hotmail account. It bounced back with the following message:

This is the mail system at host c9mailgw40.amadis.com.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<pierre@pierrepaquette.net>: host fwd.nsm.ctmail.com[69.64.145.228] said: 550
5.7.1 Invalid recipient: 'pierre@pierrepaquette.net' (in reply to RCPT TO
command)

Now http://www.amadis.com returns nothing (hangs) and http://www.ctmail.com shows an "Under Construction" page, so I can't get much info about those.

Have I been somehow hacked? Their IP address (69.64.145.228) is nothing like mine (currently 69.159.185.137) or the one returned by:
[QUOTE]
$ dig mx pierrepaquette.net

; <<>> DiG 9.4.1-P1 <<>> mx pierrepaquette.net
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 23232
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; QUESTION SECTION:
;pierrepaquette.net. IN MX

;; ANSWER SECTION:
pierrepaquette.net. 3600 IN MX 10 mail.pierrepaquette.net.

;; ADDITIONAL SECTION:
mail.pierrepaquette.net. 3600 IN A 69.159.185.137[QUOTE]

Help me please!

(I will double post this because I need an answer to this issue FAST!)

[falko]

I'd check all your MX record and change them back to your server.

[PierreQuebec]

Hello,

I changed my MX records and they should be working fine now. However, it is obvious that Postfix is not getting the messages being sent to the domains it's supposed to be watching: from my hotmail account, I sent myself a message to pierre (at) pierrepaquette.net and never got it. I check the server's log files and nothing shows up.

Everything was working just fine before my Internet connexion down time. I'm starting to wonder if my ISP didn't find me out and decided to block the ports used by Postfix?! Would there be a way to check that out?

[falko]

You should ask your ISP if they started to block port 25.