LXC + Postfix (Ubuntu 20.04) - Localdomain

[lywinston]

Hi everyone,

After a long time of research....i have a problem with configuration of postfix in LXC (Ubuntu 20.04 Proxmox Template). My server send email with "myhostname.localdomain" instead of "myhostname.mydomain.com".

Configuration :

/etc/hosts

127.0.0.1       localhost
127.0.1.1       id1546.mydomain.com id1546
::1             localhost ip6-localhost ip6-loopback
ff02::1         ip6-allnodes
ff02::2         ip6-allrouters
# --- BEGIN PVE ---
172.18.100.233 id1546.mydomain.com id1546
# --- END PVE ---

/etc/hostname

id1546

/etc/postfix/main.cf

# See /usr/share/postfix/main.cf.dist for a commented, more complete version

smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
mydestination = $myhostname, localhost.$mydomain, localhost
relayhost =
mynetworks = 127.0.0.0/8
inet_interfaces = all
recipient_delimiter = +

compatibility_level = 2

myhostname = id1546.mydomain.com
mydomain = id1546.mydomain.com

When i execute "postconf -d" the result part of myhostname and mydomain are :

mydomain = localdomain
myhostname = id1546.localdomain

I have create two files : .pve-ignore.hosts and .pve-ignore.hostname, but the problem is not solved.

So, when my server send an email, the helo is : helo=id1546.localdomain, instead of id1546.mydomain.com.

Any ideas ?

Thanks !

 

[Spoonman2002]

At the bottom of "/etc/postfix/main.cf" you need to add this line:
smtp_generic_maps = hash:/etc/postfix/generic

Then in "/etc/postfix/generic" you need to specify the mapping of the original addresses to the one you want, e.g.
root@example.com your_own_address@hotmail.com
@example.com your_own_address@hotmail.com

- save and exit
- create the postfix.db:
postmap /etc/postfix/generic

This works for me.