Postfix Connection timed out port 25

[ccanei]

Hi Guys,

I'm Brazilian and I am facing a strange issue.
I cannot send email to some mailservers and show me the bellow error:
---------------------------------------------------------------------------------------------------
[root@142358 postfix]# postqueue -p
-Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient-------
70F4E108C4F86     5988 Tue Jul 12 15:27:11  dulcevilela@carvalhovilela.com.br
 (connect to mx.terraempresas.com.br[208.84.244.133]:25: Connection timed out)
                                         certidao@5protesto.com.br

6F256108D1D20     3951 Tue Jul 12 13:40:15  contato@virtualizeja.com.br
           (connect to mx3.bol.com.br[200.147.36.13]:25: Connection timed out)
                                         claudinei.canei@bol.com.br
---------------------------------------------------------------------------------------------------

I can send and receive emails, but I cannot send to few mailservers as above message.
In my master.cf file I have:

submission      inet    n       -       n       -       -       smtpd
26      inet    n       -       n       -       -       smtpd
25      inet    n       -       n       -       -       smtpd
465      inet    n       -       n       -       -       smtpd

Also, port 25 is open in my firewall, and I haven't my IP's black listed.
I have DMARC, SPF, rDNS, TLS and NON-Open relay done without issue.

And here is a small mail log:
[root@142358 /]# tail -f /var/log/maillog:
Jul 13 12:45:19 142358 postfix/smtp[4249]: connect to mx3.bol.com.br[200.147.36.13]:25: Connection timed out
Jul 13 12:45:19 142358 postfix/smtp[4249]: 68EE5108C4F86: to=<claudinei.canei@bol.com.br>, relay=none, delay=83104, delays=83074/0/30/0, dsn=4.4.1, status=deferred (connect to mx3.bol.com.br[200.147.36.13]:25: Connection timed out)
Jul 13 12:45:19 142358 postfix/smtp[4250]: connect to mx.terraempresas.com.br[208.84.244.133]:25: Connection timed out
Jul 13 12:45:19 142358 postfix/smtp[4250]: 6A73A108D1E10: to=<certidao@5protesto.com.br>, relay=none, delay=76688, delays=76658/0/30/0, dsn=4.4.1, status=deferred (connect to mx.terraempresas.com.br[208.84.244.133]:25: Connection timed out)
Jul 13 12:45:34 142358 postfix/smtpd[4204]: connect from mx32.unodata.com.br[192.175.104.104]
Jul 13 12:45:34 142358 postfix/smtpd[4204]: NOQUEUE: reject: RCPT from mx32.unodata.com.br[192.175.104.104]: 450 4.1.1 <antoniodecarvalho@carvalhovilela.com.br>: Recipient address rejected: User unknown in virtual mailbox table; from=<alvessilva@marcelinofreitas.com.br> to=<antoniodecarvalho@carvalhovilela.com.br> proto=ESMTP helo=<mx32.unodata.com.br>
Jul 13 12:45:34 142358 postfix/smtpd[4204]: disconnect from mx32.unodata.com.br[192.175.104.104]


Any idea about how to fix? It is like 'other side' has port 25 blocked, and I imagine that, because here in Brazil is not allow to send email using port 25, but, how to change?

Thanks!

[Me.B]

Revert back the modifications you made to install TLS as you broke postfix when you did it.

M B

[ccanei]

Revert back the modifications you made to install TLS as you broke postfix when you did it.

M B

I'm facing this problem before to install TLS, in my mind it it isn't the problem.

Are you sure that I need to revert? Will not work, because I can send/receive emails, but some mail server does not allow connection at port 25.

[Me.B]

So you installed TLS and modded a broken postfix?

Restore the default installed configs. If postfix don't work don't stock pile the modifications that won't fix it.

M B

[ccanei]

So you installed TLS and modded a broken postfix?

Restore the default installed configs. If postfix don't work don't stock pile the modifications that won't fix it.

M B

Ok, can you tell me where I find the 'default config' of Postfix?

[ccanei]

One more comment...

It isn't a TLS / postfix issue, look the log:

[root@142358 sysconfig]# postqueue -p
-Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient-------
89CDE108C8710     6488 Thu Jul 14 15:33:52  dulcevilela@carvalhovilela.com.br
            (connect to mx.uol.com.br[200.147.36.15]:25: Connection timed out)
                                         ricardohilkner@uol.com.br

The other server does not accept email (IN) on port 25.

The port is closed/blocked. When I try a telnet I have the same answer:

[root@142358 sysconfig]# telnet mx.uol.com.br 25
Trying 200.147.36.15...
telnet: connect to address 200.147.36.15: Connection timed out
[root@142358 sysconfig]#

Any idea?

Thanks!

[ccanei]

One more comment...

It isn't a TLS / postfix issue, look the log:

[root@142358 sysconfig]# postqueue -p
-Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient-------
89CDE108C8710     6488 Thu Jul 14 15:33:52  dulcevilela@carvalhovilela.com.br
            (connect to mx.uol.com.br[200.147.36.15]:25: Connection timed out)
                                         ricardohilkner@uol.com.br

The other server does not accept email (IN) on port 25.

The port is closed/blocked. When I try a telnet I have the same answer:

[root@142358 sysconfig]# telnet mx.uol.com.br 25
Trying 200.147.36.15...
telnet: connect to address 200.147.36.15: Connection timed out
[root@142358 sysconfig]#

Any idea?

Thanks!

Just a comment before to close.

Some Brazilian Mail Server does not allow connection at port 25 from IP's of my host / ISP.
As my host/ISP can't change it, I have 2 choices:
1- Contact each company/mailserver that is blocking my connections and ask to allow;
2- Change my current Host/ISP.

I choose to change my Host, and I am migrating to Interserver

It's done!