Email issues with postfix

v3
#1

I’m hosting multiple domains, all use gravity forms to send mail and the mail notifications work great except one.

In all the working gravity forms notifications I’m sending notifications to a gmail account. However on the site that’s not working (let’s say example.com) I’m sending an email to [email protected] and have setup an email account using a 3rd party email service.

The log error I see in mail.log is (email address has changed):

May 8 16:14:29 localhost postfix/smtp[17792]: BBED9C1DA1: to=[email protected], relay=mx1.privateemail.com[192.64.116.198]:25, delay=0.79, delays=0.02/0.01/0.43/0.33, dsn=5.5.2, status=bounced (host mx1.privateemail.com[192.64.116.198] said: 504 5.5.2 www-data@localhost: Sender address rejected: need fully-qualified address (in reply to RCPT TO command))

#2

www-data@localhost: Sender address rejected: need fully-qualified address

You need to specify a FQDN as localhost is not a FQDN

Please paste the output of following command
postconf -n

#3

Thanks, Would I need to add one for each domain then?

Here’s the output
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
append_dot_mydomain = no
biff = no
config_directory = /etc/postfix
inet_interfaces = all
mailbox_size_limit = 0
mydestination = localhost, localhost.localdomain, localhost
myhostname = localhost
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
readme_directory = no
recipient_delimiter = +
relayhost =
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_use_tls = yes

#4

@coreyallen

myhostname = localhost

You need to change myhostname variable in /etc/postfix/main.cf
Then restart postfix
service postfix restart

#5

@miteshshah Does the hostname need to be a FQDN which is associated with my server? Similar to @coreyallen, my server runs multiple domains, and emails sent to gmail work fine, but for 3rd party emails, they don’t. i.e. GoDaddy hosted email, or even email forwarding.

#6

Additionally, when using Amazon EC2 instances, they automatically set the hostname to the internal IP address. Does anyone know if this is causing a conflict with postfix? Do I need to change the hostname to a FQDN (example.com) which has DNS records pointing to my server?

#7

Also, I would like to reiterate this question, because I am wondering this as well:

#8

So I may have figured out the answer to my question: Here’s a helpful tutorial from Linode. Apparently there’s a Reverse DNS issue with emails. I’ll list a few tutorials here:

https://www.linode.com/docs/email/running-a-mail-server (just read the part about hostnames)

#9

Hi @coreyallen

It’s been a long time, and we haven’t heard from you. It looks like your issue is resolved.

I am closing this support topic for now. Feel free to create a new support topic if you have any queries further. :slight_smile:

#10