450 - greylisted

I did a quick google on the SMTP codes, here is a handy reference:

http://email.about.com/cs/standards/a/smtp_error_code_2.htm

(from the first page of that link) the first number: 4: The server has encountered a temporary failure. If the command is repeated without any change, it might be completed. Mail servers can use such temporary failures to keep untrusted senders at bay.
5: The server has encountered an error.

So actually both 450 and 550 are valid codes, the difference is that 450 is "temporary". I would say it is probably safe overall to allow 450 codes, especially since the known greylisting issue. although I still like the idea of checking for the "greylist" keyword along with 450 to be sure that was the issue.

Ahh. had to read again what was posted, that appears correct. basically if the server is inviting you to try again later, well email verify should take that as a good response. ok now I am in favor of just removing that whole 450 part.

Hi Rainman - I just was facing this issue myself with a user on my site. What do you recommend I change in the module - or has this been fixed in a dev version?

Thanks,

Tobias

Wow, thanks for reminding me, I had made a change and forgot to document.. appearently it works because I haven't thought of it since :)

Here is what I did, in email_verify.inc.php changed line 96 to remove the 450 code part

96c96

<       ereg("^4", $to) && !ereg("^450", $to)) {

--- changed to

>       ereg("^4", $to)) {

Not saying this is necessarily correct, just what I did which resolved the issue for me.

thanks rainman! I'l try this out.

-T

Got the same. The entry in watchdog:
Rejected email address: xxx@xxx.xxx.ru. Reason: 450 4.7.1 : Recipient address rejected: Greylisted for 60 second

+1 subscribing.

Due to Drupal 6's EOL, I am closing this with "won't fix." If you feel this is still valid for any of the 7.x branches, feel free to re-open and update this issue.