csnyder wrote:
Most mail-related problems have nothing to do with the sendmail line
used by PHP. They are typically problems further downstream in the
mail system.
A common one is assuming that the localhost mail server is working
because it accepts the mail from the application. I see a lot of
bounces in my mail logs from web sites which ship mail from the
box-stock and unconfigured sendmail servers on localhost. These
machines will often not be registered in DNS or will lack a valid PTR
record or will greet target server with a generic "HELO
bogus.site.name". An increasing number of mail servers are doing DNS
checks of mail servers as an anti-spam defense.
Case in point:
Jun 11 04:13:55 jack postfix/smtpd[57160]: NOQUEUE: reject: CONNECT from
unknown[62.160.92.240]: 554 5.7.1 Client host rejected: cannot
find your hostname, [62.160.92.240]; proto=SMTP
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