Announcement: New Knowledge Base

4 June 2020: We are pleased to announce the launch of a new Knowledge Base, Changelogs for Business Security Products, where you can find more details, such as bugfixes or new features, about the most recent releases of our business-related products.

reject=550 5.7.1

Hii,

I' m Ilker. I 'm from Tukey.We are use Proofpoint .We are problem recivie one mail addrees.Error "reject=550 5.7.1"

ruleset=try_tls

 

help me

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