When sending an email you may receive the following error:
'451 Greylisted, please try again in 300 seconds'
Greylisting is one of the anti-spam features of SmarterMail and can be turned off by request if you are receiving a lot of errors.
Greylisting is effective because spammers will not usually bother to attempt a second delivery, but legitimate e-mail servers will.
'451 Greylisted, please try again in 300 seconds'
Greylisting is one of the anti-spam features of SmarterMail and can be turned off by request if you are receiving a lot of errors.
What is Greylisting and how does it work?
Greylisting is a new tool in the fight against spam. It will temporarily block incoming mail from a sender and then returns the mail to the sender's mail server with a message saying effectively, "try again later." The sending server must then retry sending the mail after the Block Period but before the Pass Period (see below for definitions of these values).Greylisting is effective because spammers will not usually bother to attempt a second delivery, but legitimate e-mail servers will.
