Issue Mail send failed

[sandy30j]

if I want to send a mail it will be in the waiting list and will not be sent. Mail Log says:
Jan 13 18:13:37 **** postfix/qmgr[53155]: DACB2122EC8: from=<info@*****>, size=4350, nrcpt=1 (queue active)
Jan 13 18:13:37 ***** postfix/qmgr[53155]: 96B40122F9E: from=<info@*****.de>, size=4339, nrcpt=1 (queue active)
Jan 13 18:13:38 ****** postfix/anvil[53994]: statistics: max connection rate 2/60s for (smtp:185.222.209.40) at Jan 13 18:06:44
Jan 13 18:13:38***** postfix/anvil[53994]: statistics: max connection count 1 for (smtp:91.97.215.206) at Jan 13 18:04:14
Jan 13 18:13:38 **** postfix/anvil[53994]: statistics: max cache size 2 at Jan 13 18:06:41
Jan 13 18:14:07 ***** postfix/smtp[54180]: connect to mx01.emig.gmx.net[212.227.17.5]:25: Connection timed out
Jan 13 18:14:07 ***** postfix/smtp[54179]: connect to mx01.emig.gmx.net[212.227.17.5]:25: Connection timed out

Connection Timeout say me Problem with firewall? But i dont have the Firewall on?!?!?
Can someone help me?

 

[IgorG]

I can connect to this server with port 25 without any problem:

$ telnet mx01.emig.gmx.net 25
Trying 212.227.17.5...
Connected to mx01.emig.gmx.net.
Escape character is '^]'.
220 gmx.net (mxgmx116) Nemesis ESMTP Service ready

Make sure that port 25 is not firewalled there and you can ping this hostname at least.

 

[Bitpalast]

Two possible reasons:
- GMX is blocking the server's IP or network, because recently spam or other attack types were sent from there.
- The on-server firewall might not block port 25, but there could be an additional firewall in front of your server that is blocking it. Check your hosting provider's control panel to configure that firewall if it exists.