| Robert S |
03-12-2024 08:58 PM |
Sendmail: messages being blocked by atmailcloud.com - "stat=Deferred"
I have been unable to send messages to certain ISPs, and am getting these messages:
Quote:
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
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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
Quote:
$ 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
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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:
Quote:
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
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