How to customize SMTP port settings for Xcally Voicemail alerts

Unfortunately, voicemails cannot use SMTP but only Postfix, therefore you need to configure it to use its relay.

To set up Postfix to use your email account as an SMTP relay, you can follow these steps:

1. Configure Postfix to use your email account as the SMTP relay by editing the file /etc/postfix/main.cf and adding the following lines:

relayhost = [smtp.yoursmtpprovider]:25
smtp_use_tls = yes
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous

2. Create the file /etc/postfix/sasl_passwd and add the following line:

[smtp.yoursmtpprovider]:25 USERNAME@yourprovider.com:PASSWORD 

Replace USERNAME with your Gmail username and PASSWORD with your Gmail password.

3. Set the permissions for the sasl_passwd file to be only readable by root with the command:

sudo chmod 600 /etc/postfix/sasl_passwd 

4. Generate a hash of the sasl_passwd file by running the command:

sudo postmap /etc/postfix/sasl_passwd

5. Restart Postfix to apply the changes by running the command:

sudo systemctl restart postfix

After completing these steps, your Postfix should be set up to use your email provider as the SMTP relay. You can test it by sending an email using the mail command or any other email client configured to use your local Postfix installation.