Greylist
- Click 'SMTP' > 'Greylist' in the left menu.
- Greylisting is another form of spam control whereby Secure Email Gateway will temporarily reject mail from senders it does not recognize. Instead, it will send a 'try again later' message to the sending mail server.
- Upon receiving this message, legitimate mail servers will try to resend the mail after a delay. Secure Email Gateway will accept the resent mail providing it does not fall foul of its other filters.
- However, because of the prohibitive cost of re-sending millions of mails, spam servers are unlikely to perform this simple resend This means greylisting can be very effective at blocking large amounts of spam at source.
- You have the option to disable greylisting entirely, or you can specify IP addresses/domains as exceptions (so CSEG will accept mail from them on first contact).
![](/uploads/Comodo%20Secure%20Email%20Gateway%20Enterprise/d7531b549c38fedd597c2d558ff7bca9/5eac818f1e1c4adc19d335055b06586b/8694e26c65ea22b02fa6e7aa433f78f7/DAS_LDAP_DB16_071818.png)
See 'Greylist
Ignored IP Addresses/Domains' for how to add domains, networks
and IP addresses to Greylist ignored list.