mail received at sendmail has relay=localhost [[UNIX: localhost]] check_rcpt fails
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I debugged the sendmail configuration file and found that this rule fails as its receiving the client_addr as localhost and client_resolve is resolving to NULL. and client_name is getting set to client_name which it tries to resolve into some hostname.
My hostname is a.b.c
its converting it to localhost.b.c
Yes but if I understand the doc rigth, the SMART HOST is not your mailserver, but the mailserver your MTA will use to send outgoing mail, instead of sending it directly.
I understood that this is the same as the 'relayhost' parameter in postfix.
Look at this, they use it in the way I would use it :