iredmail increase mail attachment size
Default mail attachment size in iredmail is 10 MB. To increase mail attachment size, login to server as user root, run following…
Zimbra webmail not working on port 80/443
On Zimbra mail server, webmail stopped working on Port 80/443. Admin interface worked properly on url https://hostname:7071/. There is no errors displayed…
Zimbra Mail Server CentOS firewall settings
On CentOS 7 server with firewalld running, used following command to open ports used by Zimbra Mail Server. firewall-cmd –zone=public –permanent –add-service=http…
Zimbra redirect webmail http to https
After Zimbra mail server installed, webmail work on url https://SERVER-HOSTNAME-HERE/ If you access webmail with out HTTPS, it won’t work. To set…
Install SSL Certificate on Zimbra mail server
To install SSL certificate for Zimbra Mail Server, login to server, switch to user zimbra Now create file commercial.key, paste your Private…
Email Marketing
https://sendpulse.com – Free upto 500 subscribers. https://convertkit.com – Free upto 1000 subscribers. https://mailchimp.com – Free upto 2000 subscribers. https://www.gmass.co – Allow you…
DMARC
DMARC is used to protect your email from email spoofing. DMARC use SPF and DKIM record to validate your email. DMARC is…
Postfix disable IPv6
To disable IPv6 on the postfix mail server, edit vi /etc/postfix/main.cf Find inet_protocols = all Replace with inet_protocols = ipv4 Restart postfix…
Configure postfix to relay mails using Gmail
Install postfix apt update apt install postfix libsasl2-modules Create file touch /etc/postfix/sasl_passwd chmod 600 /etc/postfix/sasl_passwd vi /etc/postfix/sasl_passwd Add [smtp.gmail.com]:587 user@gmail.com:password Save and…
Zimbra Unable to validate certificate chain
On installing SSL on the Zimbra mail server, i get the following error This was due to SSL cert chain. The ca-bundle…
Postfix Delete Mails from a user
To delete emails from a particular user from postfix mail queue, run postqueue -p | grep USER_HERE | cut -d’ ‘ -f1…