Sendmail: messages being blocked by atmailcloud.com - "stat=Deferred"
by Robert S from LinuxQuestions.org on (#6KA42)
I have been unable to send messages to certain ISPs, and am getting these messages:
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The common factor is that they all use mx-20.au-east.atmailcloud.com. Eventually I'm notified that the messages have not been delivered.
If I connect to mx-20.au-east.atmailcloud.com
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We are a small business, and don't send bulk email. There's no evidence that we harbour a robot that is sending out spam messages.
I have tried to de-list my IP address from Cloudmark, but their web page says I'm not listed.
Is there any way I can resolve this using my Sendmail config - I assume if the connection is throttled, it might still be possible to make a connection.
My sendmail config:
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| 2024-03-09T17:44:16.863099+11:00 debian sm-mta[27973]: 42740Zgm790989: to=<XXXXX@iinet.net.au>, ctladdr=<MYUSER@MYDOMAIN.net.au> (1004/1004), delay=2+02:43:41, xdelay=00:00:00, mailer=esmtp, pri=27852616, relay=mx-20.au-east.atmailcloud.com., dsn=4.5.0, stat=Deferred |
If I connect to mx-20.au-east.atmailcloud.com
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| $ telnet mx-20.au-east.atmailcloud.com 25 Trying 3.106.43.229... Connected to mx-20.au-east.atmailcloud.com. Escape character is '^]'. 451-conn-401: IP [XXX.XXX.XX.XX] is listed on Cloudmark CSI Suspect - is 451 currently being throttled |
I have tried to de-list my IP address from Cloudmark, but their web page says I'm not listed.
Is there any way I can resolve this using my Sendmail config - I assume if the connection is throttled, it might still be possible to make a connection.
My sendmail config:
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| divert(-1)dnl divert(0)dnl define(`_USE_ETC_MAIL_')dnl include(`/usr/share/sendmail/cf/m4/cf.m4')dnl VERSIONID(`$Id: sendmail.mc, v 8.12.3-6.6 2003-09-17 18:35:09 cowboy Exp $') OSTYPE(`debian')dnl DOMAIN(`debian-mta')dnl undefine(`confHOST_STATUS_DIRECTORY')dnl #DAEMON_HOSTSTATS= MASQUERADE_AS(`MYDOMAIN.net.au')dnl FEATURE(`masquerade_envelope')dnl FEATURE(`allmasquerade')dnl LOCAL_DOMAIN(`MYDOMAIN.net.au')dnl define(`confDOMAIN_NAME', `MYDOMAIN.net.au')dnl FEATURE(`use_cw_file')dnl FEATURE(`smrsh')dnl define(`confLOG_LEVEL',10)dnl FEATURE(`access_db')dnl FEATURE(`blacklist_recipients')dnl FEATURE(accept_unresolvable_domains)dnl FEATURE(`dnsbl', `xbl.spamhaus.org',`"550 Message from "$&{client_addr}" rejected as spam - see http://www.spamhaus.org/query/bl?ip="$&{client_addr}"')dnl INPUT_MAIL_FILTER(`opendkim', `S=inet:8891@localhost') INPUT_MAIL_FILTER(`greylist',`S=local:/var/run/milter-greylist/milter-greylist.sock,F=, T=S:4m;R:4m') define(`confMILTER_MACROS_CONNECT', `j, {if_addr}') define(`confMILTER_MACROS_HELO', `{verify}, {cert_subject}') define(`confMILTER_MACROS_ENVRCPT', `{greylist}, {client_resolve}') INPUT_MAIL_FILTER(`clmilter',`S=local:/run/clamav/clamav-milter.ctl,F=, T=S:4m;R:4m')dnl define(`confMILTER_MACROS_ENVFROM', ``i, {auth_type}, {auth_authen}, {auth_ssf}, {auth_author}, {mail_mailer}, {mail_host}, {mail_addr}'') define(`confMAX_MESSAGE_SIZE', 20000000)dnl define(`confBAD_RCPT_THROTTLE',`3')dnl define(`confMAXRCPTSPERMESSAGE', `200')dnl define(`LOCAL_MAILER_PATH', `/usr/bin/procmail')dnl FEATURE(`local_procmail')dnl include(`/etc/mail/sasl/sasl.m4')dnl define(`confAUTH_OPTIONS', `p,y')dnl include(`/etc/mail/tls/starttls.m4')dnl LOCAL_CONFIG O CipherList=HIGH O ServerSSLOptions=+SSL_OP_NO_SSLv2 +SSL_OP_NO_SSLv3 +SSL_OP_CIPHER_SERVER_PREFERENCE O ClientSSLOptions=+SSL_OP_NO_SSLv2 +SSL_OP_NO_SSLv3 MAILER(`procmail')dnl MAILER(local)dnl MAILER(smtp)dnl |