Ruby Mail Gem Relay Access from Localhost to Postfix

Question

I'm on a workstation that doesn't have a FQDN. I'm developing in Ruby and using the mail gem. I host my own mail server on the LAN. I want to forward outgoing emails to this server, off to a gmail recipient (example).

Due to the fact I'm on my workstation (localhost), it not being recognized as part of one of my LAN domains (I have a static IP), it isn't being recognized by Postfix (from my mail server log):

Mar 25 08:44:30 machine.mydomain1.com postfix/smtpd[9653]: sacl_check: mbr_user_name_to_uuid([email protected]) failed: No such file or directory
Mar 25 08:44:30 machine.mydomain1.com postfix/cleanup[9657]: sacl_check: mbr_user_name_to_uuid([email protected]) failed: No such file or directory
Mar 25 08:44:30 machine.mydomain1.com postfix/smtp[9658]: 92946D63CD4: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10024, delay=0.14, delays=0.01/0.01/0/0.11, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as AE8ECD63CDA)
Mar 25 08:44:31 machine.mydomain1.com postfix/smtp[9661]: AE8ECD63CDA: to=<[email protected]>, relay=gmail-smtp-in.l.google.com[173.194.195.26]:25, delay=0.52, delays=0/0.01/0.34/0.16, dsn=5.7.1, status=bounced (host gmail-smtp-in.l.google.com[173.194.195.26] said: 550-5.7.1 [206.248.184.17      11] Our system has detected that this message is 550-5.7.1 not RFC 5322 compliant: 550-5.7.1 'From' header is missing. 550-5.7.1 To reduce the amount of spam sent to Gmail, this message has been 550-5.7.1 blocked. Please visit 550-5.7.1  https://support.google.com/mail/?p=RfcMessageNonCompliant 550 5.7.1 and review RFC 5322 specifications for more information. a2si7453997iog.10 - gsmtp (in reply to end of DATA command))
Mar 25 08:56:42 machine.mydomain1.com postfix/smtpd[9764]: NOQUEUE: reject: RCPT from unknown[192.168.1.4]: 554 5.7.1 <[email protected]>: Relay access denied; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<mydomain3.ca>

I can use the mail gem properly on another box that has a FQDN just fine. I just can't seem to get it to work on my workstation. As it states in the mail server log:

'From' header is missing. 550-5.7.1 To reduce the amount of spam sent to Gmail, this message has been 550-5.7.1 blocked.

I'm assuming this is the machine name from, and not the email sender from. How can I tell the mail server that I'm not localhost? I've messed with the relay and other directives in postfix to no avail. So I'm trying to modify the Ruby syntax to make the server recognize me.

Any insight appreciated as to how I can get this to work. It's my development box and it's working on my production server, but I'd like to have it working on my dev box.

Answer 1

Adding the following fixed it, a config item for the gem:

mail.header['From'] = 'machine.mydomain.com'

Also making sure the relay information in postfix is set properly.