Greylisting ??? RSS Back to forum
@steve.mills:
It is the latter:
If "Accept Delivery Retries from the same /24 subnet" is turned on, the second, re-attempted delivery is accepted from the same subnet. (E.g., first Greylisted attempt comes from 1.2.3.4, second comes from 1.2.3.5 --> email is allowed through).
If it is turned off, the re-attempt is accepted from the same IP only. (E.g., first Greylisted attempt comes from 1.2.3.4, second comes from 1.2.3.5 --> email is Greylisted again).
We recommend adding either the IP ranges* or domains of such larger organizations to the Greylisting Exceptions (Gmail, Yahoo, Windows Live / Outlook.com).
Gmail IP ranges: https://support.google.com/a/answer/60764?hl=en
Outlook.com IP ranges: https://mail.live.com/mail/ipspace.aspx
* As these may change quite frequently, excepting domain names might be a better approach, but may exclude spoofed emails some from Greylisting. Since the email will be subject to further tests (including the SPF test), this is usually not a problem.
Greylisting is a nice feature but larger organizations (Gmail for example) may send email from a large range of IPs.
There is a setting under greylisting "Accept Delivery Retries from the same /24 subnet"
If you turn that off - Does it mean the email can come from anywhere on the retry? Or does it mean it would have to come from the same IP?
I assume the latter - but wanted to make sure.