Re: Reject email containing Google forms
lists: > About 70% of my spam these days contains links to Google Forms. > I've been googling for tips on how to reject such email but Google > find hits for the converse. (People are complaining about Gmail > blocking Google Forms which is ironic.)? > > My current configuration doesn't include SpamAssassin since rbls > and the existence of a reverse pointer was good enough.? > > I'm looking for advice specifically to bounce email that contains > a link to any Google form. If this is inappropriate for this list > serve then I'm fine with the moderator nuking the request. I can > take it up with stackexchange but it had been my experience that > the postfix list has the best gurus.? This will require deep instection with software that decodes base64 text, and that understands enough of HTML so that it can figure out what the links are. Postfix's built-in support for regular expressions won't be sufficient to stop this. Wietse
Re: Reject email containing Google forms
How about a general sieve rule in your dovecot server or a filter in your delivery agent? Sent from my iPhone > On Dec 1, 2020, at 5:11 PM, lists wrote: > > About 70% of my spam these days contains links to Google Forms. I've been > googling for tips on how to reject such email but Google find hits for the > converse. (People are complaining about Gmail blocking Google Forms which is > ironic.) > > My current configuration doesn't include SpamAssassin since rbls and the > existence of a reverse pointer was good enough. > > I'm looking for advice specifically to bounce email that contains a link to > any Google form. If this is inappropriate for this list serve then I'm fine > with the moderator nuking the request. I can take it up with stackexchange > but it had been my experience that the postfix list has the best gurus. > > > >
Reject email containing Google forms
About 70% of my spam these days contains links to Google Forms. I've been googling for tips on how to reject such email but Google find hits for the converse. (People are complaining about Gmail blocking Google Forms which is ironic.) My current configuration doesn't include SpamAssassin since rbls and the existence of a reverse pointer was good enough. I'm looking for advice specifically to bounce email that contains a link to any Google form. If this is inappropriate for this list serve then I'm fine with the moderator nuking the request. I can take it up with stackexchange but it had been my experience that the postfix list has the best gurus.
Re: Postfix says "Cannot start TLS: handshake failure" when try to send to Exchange 2007 Server
Several years ago, I had trouble delivering to an old exchange server while trying to enforce TLS. I'm not sure if this applies to your situation, but this worked for me. In main.cf, I have smtp_tls_policy_maps = hash:/etc/postfix/tls_policy In tls_policy, I added domainname encrypt ciphers=low exclude=MD5:SRP:PSK:aDSS:kECDH:kDH:SEED:IDEA:RC2 On 2020-11-30 1:07 pm, SysAdmin EM wrote: > I use Postfix as an SMTP server, in the last few days I have started to see > an error delivering mail to some servers. > > I am trying to deliver an email to a Server with Microsoft Exchange 2007 and > I receive the following message. > >> Nov 30 15:29:40 smarthost04-ded postfix-out/qmgr[9305]: 56253920A60: >> from=, size=7238, nrcpt=1 (queue active) Nov >> 30 15:29:40 smarthost04-ded postfix/smtp[9335]: 32FEC920C41: >> to=, >> relay=127.0.0.1[127.0.0.1]:10026, delay=0.24, delays=0.1/0/0.04/0.09, >> dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 56253920A60) Nov 30 >> 15:29:40 smarthost04-ded postfix-out/smtp[9312]: 56253920A60: Cannot >> start TLS: handshake failure Nov 30 15:29:40 smarthost04-ded >> postfix-out/smtp[9312]: 56253920A60: >> to=, >> relay=exet02.hostmar.com [1][200.58.120.69]:25, delay=0.12, >> delays=0.09/0/0.03/0, dsn=4.7.5, status=deferred (Cannot start TLS: >> handshake failure) > > I have read the documentation but I cannot understand why this error occurs. > > This is my configuration > > ``` > postconf mail_version > mail_version = 3.5.2 > > smtp_tls_exclude_ciphers = MD5,SRP,PSK,aDSS,kECDH,kDH,SEED,IDEA,RC2,RC5,RC4 > smtp_tls_protocols = !SSLv2:!SSLv3 > smtpd_tls_cert_file = /etc/pki/tls/certs/linux.ferozo.com.pem > smtpd_tls_key_file = /etc/pki/tls/private/linux.ferozo.com.key > smtpd_tls_security_level = may > smtpd_tls_session_cache_database = btree:/var/lib/postfix/ssl/smtpd_ssl_cache > smtp_tls_security_level = may > smtp_tls_session_cache_database = btree:/var/lib/postfix/ssl/smtp_ssl_cache > > ``` > > Here I make a connection to the destination server > > ``` > posttls-finger -c -Ldebug "exet02.hostmar.com [1]" > posttls-finger: initializing the client-side TLS engine > posttls-finger: setting up TLS connection to exet02.hostmar.com > [1][200.58.120.69]:25 > posttls-finger: exet02.hostmar.com [1][200.58.120.69]:25: TLS cipher list > "aNULL:-aNULL:HIGH:MEDIUM:+RC4:@STRENGTH:!aNULL" > posttls-finger: SSL_connect:before/connect initialization > posttls-finger: SSL_connect:SSLv2/v3 write client hello A > posttls-finger: SSL_connect error to exet02.hostmar.com > [1][200.58.120.69]:25: lost connection > ``` > Any ideas?? > > Regards, Links: -- [1] http://exet02.hostmar.com
