Sorry, me again :-) Is there a way to tell opensmtpd to relay only using IPV4 for mta? I googled it I found that "limit mta inet4" doesn't work and prevents opensmtpd from starting. The manual doesn't say anything about it.
The reason is that opensmtpd tries first a bunch of IPV6 addresses corresponding to smtp.office365.com, all failing, then finally finds an IPV4 address that works. See below. Thanks! Apr 2 20:32:09 raspberrypi4GB smtpd[94911]: 043f05fd01c65762 mta connecting address=smtp+tls://[2603:1016:401:1840::2]:587 host=2603:1016:401:1840::2 Apr 2 20:32:09 raspberrypi4GB smtpd[94911]: 043f05fd01c65762 mta error reason=Connection failed: Network is unreachable Apr 2 20:32:09 raspberrypi4GB smtpd[94911]: smtp-out: Disabling route [] <-> [2603:1016:401:1840::2] (2603:1016:401:1840::2) for 15s Apr 2 20:32:11 raspberrypi4GB smtpd[94911]: 043f05fe883a0089 mta connecting address=smtp+tls://[2603:1016:401:2003::2]:587 host=2603:1016:401:2003::2 Apr 2 20:32:11 raspberrypi4GB smtpd[94911]: 043f05fe883a0089 mta error reason=Connection failed: Network is unreachable Apr 2 20:32:11 raspberrypi4GB smtpd[94911]: smtp-out: Disabling route [] <-> [2603:1016:401:2003::2] (2603:1016:401:2003::2) for 15s Apr 2 20:32:14 raspberrypi4GB smtpd[94911]: 043f05ffd86b69cd mta connecting address=smtp+tls://[2603:1016:401:2c0a::2]:587 host=2603:1016:401:2c0a::2 Apr 2 20:32:14 raspberrypi4GB smtpd[94911]: 043f05ffd86b69cd mta error reason=Connection failed: Network is unreachable Apr 2 20:32:14 raspberrypi4GB smtpd[94911]: smtp-out: Disabling route [] <-> [2603:1016:401:2c0a::2] (2603:1016:401:2c0a::2) for 15s Apr 2 20:32:15 raspberrypi4GB smtpd[94911]: 043f06004d81a9a6 mta connecting address=smtp+tls://[2603:1016:401:1001::2]:587 host=2603:1016:401:1001::2 Apr 2 20:32:15 raspberrypi4GB smtpd[94911]: 043f06004d81a9a6 mta error reason=Connection failed: Network is unreachable Apr 2 20:32:15 raspberrypi4GB smtpd[94911]: smtp-out: Disabling route [] <-> [2603:1016:401:1001::2] (2603:1016:401:1001::2) for 15s Apr 2 20:32:17 raspberrypi4GB smtpd[94911]: 043f0601fa69d671 mta connecting address=smtp+tls://52.98.143.178:587 host=52.98.143.178 Apr 2 20:32:17 raspberrypi4GB smtpd[94911]: 043f0601fa69d671 mta connected Apr 2 20:32:17 raspberrypi4GB smtpd[94911]: 043f0601fa69d671 mta tls ciphers=TLSv1.3:TLS_AES_256_GCM_SHA384:256 Apr 2 20:32:17 raspberrypi4GB smtpd[94911]: 043f0601fa69d671 mta server-cert-check result="success" On Fri, 31 Mar 2023 at 22:16, Thomas Bohl <opensmtpd-misc-64...@aloof.de> wrote: > Hello, > > > action "relay" relay host smtp+tls://smtp.office365.com:587 > > auth <secrets> > > the relay-url is missing the label. > > man smtpd.conf > ... > The format for relay-url is > [proto://[label@]]host[:port]. > ... > The label corresponds to an entry in a credentials table, > as documented in table(5). It is used with the > “smtp+tls” and “smtps” protocols for authentication. > ... > > This should work: > > action "relay" relay host smtp+tls://msexcha...@smtp.office365.com:587 > auth <secrets> > > cat /etc/mail/secrets: > msexchange ad...@mydomain.com.au:*password* > > >
