Route emails locally for the same domain

[tanmalik786]

Hi there,
I have found that even my local emails are being sent out of my server and then are routed back to this domain, how can I route emails locally for my domain [example.com] to reside on the same server and the attachments if any are not duplicated either in this case are rather shared through "symbolic links".

If someone can share a Script for WHM to route emails locally for the same domain, that will be great. I did try this script but failed on two accounts

1. it failed to fetch 'dig' command failed to fetch any MX record [even though when executed directly, it succeeds]
2. I am using CentOS v7.9.2009 STANDARD cPanel v110.0.2, and I don't find any `postfix` folder under `/etc` or even `main.cf` file for that matter.

`

#!/bin/bash

​

# Add your domain name below​

domain="example.com"​

​

# Retrieve the local mail exchanger (MX) records for the domain​

mx_records=$(dig +short MX $domain | awk '{print $2}' | sort -n)​

​

# Create an array to store the local mail exchangers​

local_mx=()​

​

# Loop through each MX record and check if it points to the local server​

for mx in $mx_records​

do​

if [[ $mx == "$(hostname -f)" ]]; then​

local_mx+=($mx)​

fi​

done​

​

# Check if there are any local mail exchangers​

if [ ${#local_mx[@]} -eq 0 ]; then​

echo "No local mail exchangers found for $domain."​

exit 1​

fi​

​

# Create a Postfix transport map file​

transport_file="/etc/postfix/transport"​

​

# Create or overwrite the transport map file​

echo "$domain local:${local_mx[0]}" > $transport_file​

​

# Update the transport map​

postmap $transport_file​

​

# Configure Postfix to use Maildir format and create symbolic links for attachments​

main_cf="/etc/postfix/main.cf"​

attachments_dir="/var/mail/attachments"​

​

# Add or update the configuration in main.cf​

echo "​

# Configure Postfix to use Maildir format and symbolic links for attachments​

home_mailbox = Maildir/​

maildir_copy = no​

mime_directory = $attachments_dir​

" >> $main_cf​

​

# Create the attachments directory​

mkdir -p $attachments_dir​

​

# Set permissions for the attachments directory​

chown -R postfix:postfix $attachments_dir​

​

# Restart the Postfix service​

service postfix restart​

​

echo "Email routing for $domain has been configured to route locally."​

echo "Attachments will be shared using symbolic links."​

​

​

​

`
I will appreciate any assistance to get this resolved.
Thanks and Regards,

 

[cPRex]

Hey there! cPanel doesn't use Postfix, so the code you provided wouldn't be helpful on a cPanel machine.

The setting you likely need to adjust is inside cPanel >> Email Routing for the affected domain. Just ensure that is set to the "Local mail exchanger" option and then system will deliver the messages locally.

 

[tanmalik786]

Thanks for your reply @cPRex, yes that's what I have concluded as well. I have set cPanel >> Email Routing to "Automatic", hope that's equally good?

I was wondering if there's a way to "not to duplicate" the attachments when they are sent to an email address of the same `domain`, and instead the same `attachment` is shared through a Symbolic Link.

Keenly awaiting for your response?
Thanks again!

 

[cPRex]

Automatic should be just fine as well.

Are you saying that if one email with an attachment is sent to [email protected] and also [email protected] that you'd like the attachment to only physically exist in one spot on the server and the others are a link to it? I'm assuming the goal is to save disk space, but I don't believe that is possible in a standard email environment because each email user is limited to their own directory structure. There isn't a "public" area like you could create with FTP.

 

[tanmalik786]

Automatic should be just fine as well.

Are you saying that if one email with an attachment is sent to [email protected] and also [email protected] that you'd like the attachment to only physically exist in one spot on the server and the others are a link to it? I'm assuming the goal is to save disk space, but I don't believe that is possible in a standard email environment because each email user is limited to their own directory structure. There isn't a "public" area like you could create with FTP.

I wouldn't mind this a bit either, what actually I was asking was that "if [email protected] sends an email to [email protected] and [email protected] and it does contain an attachment as well [email is being sent and received on the same domain]" that attachment should be shared amongst the users through a "Symbolic Link"?

 

[cPRex]

Right, I think we're saying the same thing just in different words. Unfortunately, I'm not aware of a way to do that and I didn't find anything like that in the Exim documentation when looked there either.

 

[tanmalik786]

Right, I think we're saying the same thing just in different words. Unfortunately, I'm not aware of a way to do that and I didn't find anything like that in the Exim documentation when looked there either.

Hmm .. thanks for you support though.