I tried to sending out an email using php mail() function but it failed somehow, complaining that a real domain name is required. The following is observed in the maillog:
sendmail 4984 r25984: from=apache, size=273, class=0, nrcpts=1,
msgid=<201.r25@localhost.localdomain>, relay=apache@localhost
sendmail 4985 r25985: ruleset=check_mail,
arg1=, relay=mydomain.com [127.0.0.1],
reject=553 5.5.4 … Real domain name
required for sender address
sendmail 4984 r25984:
to=external@server.com, ctladdr=apache (48/48), delay=00:00:01,
xdelay=00:00:00, mailer=relay, pri=30273, relay=[127.0.0.1]
[127.0.0.1], dsn=5.6.0, stat=Data format error
sendmail 4984
r25984: r25984: DSN: Data format error
cron is able to send email to external@server.com whenever there is a problem with logrotate. I am not sure why php is unable to do so. I tried making changes to the default configuration in `sendmail.mc with the following:
MASQUERADE_AS(`mydomain.com')dnl
FEATURE(masquerade_envelope)dnl
FEATURE(masquerade_entire_domain)dnl
MASQUERADE_DOMAIN(localhost)dnl
MASQUERADE_DOMAIN(localhost.localdomain)dnl
MASQUERADE_DOMAIN(mycom)dnl
But, it doesn't seem to have any effect. The header from address in php mail function has already been set. I have also ensured that SELinux httpd_can_sendmail is enabled. What else to I need to do to get the mail delivered?
Best Answer
I think I have just solved it. I have the following in /etc/hosts:
What I need is to place myserver.com in front of the line with
localhost.localdomainso that sendmail will think that it is using a real domain to send out the email.