Re: smtp timeout
* Richard Smits r.sm...@tudelft.nl: Hello, We have a problem in SMTP communication with some external mailservers. I will explain. If i do a telnet to port 25 on a remote server, I get no greeting message, it just waits. I suppose this is some greeting delay for anti spam. It comes after 40s! -- Ralf Hildebrandt Geschäftsbereich IT | Abteilung Netzwerk Charité - Universitätsmedizin Berlin Campus Benjamin Franklin Hindenburgdamm 30 | D-12203 Berlin Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962 ralf.hildebra...@charite.de | http://www.charite.de
Re: smtp timeout
* Ralf Hildebrandt ralf.hildebra...@charite.de: * Richard Smits r.sm...@tudelft.nl: Hello, We have a problem in SMTP communication with some external mailservers. I will explain. If i do a telnet to port 25 on a remote server, I get no greeting message, it just waits. I suppose this is some greeting delay for anti spam. It comes after 40s! So, I tried sending mail there and it worked on the first try: Feb 23 11:54:31 mail postfix/cleanup[23074]: 095F81C362D: warning: header Subject: Test postmas...@ujf.cas.cz from local; from=...@charite.de to=postmas...@ujf.cas.cz Feb 23 11:55:09 mail postfix/smtp[18516]: setting up TLS connection to mx.ujf.cas.cz[147.231.100.6]:25 Feb 23 11:55:09 mail postfix/smtp[18516]: certificate verification failed for mx.ujf.cas.cz[147.231.100.6]:25: untrusted issuer /C=CZ/ST=Czech Republic/L=Rez/O=UJF AVCR/OU=ITU/CN=UJF AVCR Root CA/emailAddress=i...@ujf.cas.cz Feb 23 11:55:09 mail postfix/smtp[18516]: Untrusted TLS connection established to mx.ujf.cas.cz[147.231.100.6]:25: TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits) Feb 23 11:55:09 mail postfix/smtp[18516]: 095F81C362D: to=postmas...@ujf.cas.cz, relay=mx.ujf.cas.cz[147.231.100.6]:25, delay=38, delays=0/0/38/0.05, dsn=4.7.1, status=deferred (host mx.ujf.cas.cz[147.231.100.6] said: 451 4.7.1 Greylisting in action, please come back later (in reply to RCPT TO command)) -- Ralf Hildebrandt Geschäftsbereich IT | Abteilung Netzwerk Charité - Universitätsmedizin Berlin Campus Benjamin Franklin Hindenburgdamm 30 | D-12203 Berlin Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962 ralf.hildebra...@charite.de | http://www.charite.de
Re: smtp timeout
Zitat von Ralf Hildebrandt ralf.hildebra...@charite.de: * Richard Smits r.sm...@tudelft.nl: Hello, We have a problem in SMTP communication with some external mailservers. I will explain. If i do a telnet to port 25 on a remote server, I get no greeting message, it just waits. I suppose this is some greeting delay for anti spam. It comes after 40s! It's Sendmail... Maybe some Spam-Attack got them down ;-) smime.p7s Description: S/MIME Cryptographic Signature
Re: smtp timeout
On 02/23/2011 11:56 AM, lst_ho...@kwsoft.de wrote: Zitat von Ralf Hildebrandt ralf.hildebra...@charite.de: * Richard Smits r.sm...@tudelft.nl: Hello, We have a problem in SMTP communication with some external mailservers. I will explain. If i do a telnet to port 25 on a remote server, I get no greeting message, it just waits. I suppose this is some greeting delay for anti spam. It comes after 40s! It's Sendmail... Maybe some Spam-Attack got them down ;-) Well, from our university computers i do not get a greeting, but from an external server i do get a greeting. I'm thinking about a firewall issue here ... But if anyone has more ideas ... Greetings .. Richard
Re: smtp timeout
Zitat von Richard Smits r.sm...@tudelft.nl: On 02/23/2011 11:56 AM, lst_ho...@kwsoft.de wrote: Zitat von Ralf Hildebrandt ralf.hildebra...@charite.de: * Richard Smits r.sm...@tudelft.nl: Hello, We have a problem in SMTP communication with some external mailservers. I will explain. If i do a telnet to port 25 on a remote server, I get no greeting message, it just waits. I suppose this is some greeting delay for anti spam. It comes after 40s! It's Sendmail... Maybe some Spam-Attack got them down ;-) Well, from our university computers i do not get a greeting, but from an external server i do get a greeting. I'm thinking about a firewall issue here ... But if anyone has more ideas ... Maybe they are using some RBL or rDNS checking which is slow and even fail for your university IPs. If you have important mail for them you should contact the remote postmaster for whitelisting you. Regards Andreas smime.p7s Description: S/MIME Cryptographic Signature
