What is email greylisting by the mail transfer agent?
What is email greylisting by the mail transfer agent?
Email greylisting by the mail transfer agent involves temporarily rejecting any email from a sender it does not recognize. If the email is legitimate, the originating server will attempt to resend the email after a delay, and then the email will be accepted. This technique helps to filter out spam, as many spam servers do not attempt to resend emails.
I will go for A. a MTA using greylisting will temporarily reject any email from a sender it does not recognize.
Greylisting is a method of defending e-mail users against spam. A mail transfer agent (MTA) using greylisting will "temporarily reject" any email from a sender it does not recognize. If the mail is legitimate, the originating server will try again after a delay, and if sufficient time has elapsed, the email will be accepted. https://en.wikipedia.org/wiki/Greylisting_(email)
greylisting is a method of defending e-mail users against spam. A mail transfer agent (MTA) using greylisting will "temporarily reject" any email from a sender it does not recognize