Re: Postfix is not open relay but send spam

On 15 Oct 2019, at 13:24, Thilo Molitor wrote: Or use openssl s_client -starttls smtp -connect :25 for tls on port 25 (in case port 465 is not configured on your server or the configuration differs from port 25) See the original poster's earlier message: his issue is specifically with a spa

Re: Postfix is not open relay but send spam

On Tue, Oct 15, 2019 at 05:15:38PM +0200, Julien Michaux wrote: > Do you have a way to test authentification with smtps ? Why bother? Your "cyrus" account has a password that is weak, leaked or perhaps even empty. Disable logins by "cyrus", you surely don't need them. -- Viktor.

Re: Postfix is not open relay but send spam

Or use openssl s_client -starttls smtp -connect :25 for tls on port 25 (in case port 465 is not configured on your server or the configuration differs from port 25) Am Dienstag, 15. Oktober 2019, 11:30:42 CEST schrieb Bill Cole: > On 15 Oct 2019, at 11:15, Julien Michaux wrote: > > Do you have a

Re: Postfix is not open relay but send spam

On 15 Oct 2019, at 11:15, Julien Michaux wrote: Do you have a way to test authentification with smtps ? openssl s_client -connect :465 That will negotiate an SSL/TLS connection with the given host on port 465 (smtps) and leave you inside the encrypted session as if you'd used 'telnet :25'

Re: Postfix is not open relay but send spam

Do you have a way to test authentification with smtps ? AUTH LOGIN over smtp is disabled so postfix reply : 503 5.5.1 Error: authentication not enabled Michaux Julien Courriel : jul...@michaux.name Le mar. 15 oct. 2019 à 16:57, Jaroslaw Rafa a écrit : > Dnia 15.10.2019 o godz. 16:47:59 Julien

Re: Postfix is not open relay but send spam

Dnia 15.10.2019 o godz. 16:47:59 Julien Michaux pisze: > Oct 13 19:41:29 mail postfix/smtps/smtpd[25100]: 5A064379357: > client=unknown[185.153.197.48], sasl_method=LOGIN, sasl_username= > cy...@mydomain.com This line says that the client at IP address 185.153.197.48 managed to authenticate to you

Re: Postfix is not open relay but send spam

Hi, Here is a log : Oct 13 19:41:28 mail postfix/qmgr[15506]: 8F189379357: removed Oct 13 19:41:28 mail postfix/smtps/smtpd[25100]: warning: hostname server-185-153-197-48.cloudedic.net does not resolve to address 185.153.197.48 Oct 13 19:41:28 mail postfix/smtps/smtpd[25100]: connect from unknow

Re: Postfix is not open relay but send spam

On 15/10/2019 08:27, Julien Michaux wrote: > Time to time, my server is attack and he sends spam. All spam are from a > specific address "cy...@mydomain.com" I tried many things but nothing works> > I have to stop postfix for some hours and attack ends until next time. > Have you tried puttin

Re: Postfix is not open relay but send spam

Hi shot me if I'm wrong ;-) but I think your smtp service is an open relay?! I don't see reject_unauth_destination after your permit_mynetwork and permit_sasl_authenticated. Thats means (at least afaik) that any mail will be accepted as long as it does not hit one of your reject_* statements. So f

Re: Postfix is not open relay but send spam

On 10/15/2019 1:27 AM, Julien Michaux wrote: Time to time, my server is attack and he sends spam. All spam are from a specific address "cy...@mydomain.com" . I tried many things but nothing works. I have to stop postfix for some hours and attack ends until next time.

Re: Postfix is not open relay but send spam

On Oct 15, 2019, at 5:22 AM, @lbutlr wrote: > There is no instance of permit_mynetworks in my main.cf not in my master.cf > file. There is no instance of permit_mynetworks in my main.cf *nor* in my master.cf file. -- 'It is always useful to face an enemy who is prepared to die for his count

Re: Postfix is not open relay but send spam

On Oct 15, 2019, at 1:27 AM, Julien Michaux wrote: > smtpd_helo_restrictions = > permit_mynetworks, > smtpd_recipient_restrictions = >permit_mynetworks, > smtp_sender_restrictions = >permit_mynetworks, > smtp_helo_restrictions = > permit_mynetworks, > smtp_recipient_restriction

Re: Postfix is not open relay but send spam

Am 15.10.19 um 09:27 schrieb Julien Michaux: > Hi everyone, > > I have a problem with postfix. > > I use OBM as a mail server (postfix + cyrus + ldap, etc...). My postfix > is not openrelay : > Do you see something in the logs how the spam enters your system? Possibly a authenticated user or so

Re: Postfix is not open relay but send spam

Dnia 15.10.2019 o godz. 09:27:42 Julien Michaux pisze: > > Time to time, my server is attack and he sends spam. All spam are from a > specific address "cy...@mydomain.com" . > I tried many things but nothing works. I have to stop postfix for some > hours and attack ends until next time. Do you ha

Postfix is not open relay but send spam

Hi everyone, I have a problem with postfix. I use OBM as a mail server (postfix + cyrus + ldap, etc...). My postfix is not openrelay : 220 xx ESMTP Postfix (Debian/GNU) [706 ms] EHLO keeper-us-east-1c.mxtoolbox.com 250-xx 250-PIPELINING 250-SIZE 52428800 250-VRFY 250-ETRN 250-STARTTLS 25