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I have a Google Apps account, with 2-step verification, set up in Apple mail. Typically it works great for several weeks, or a month, but then the SMTP server has (Offline) next to it, and it will refuse to send from that email address. I still can receive mail into that account. I believe deleting the account from and adding it back in fixes the problem for awhile, but is there something that I should look for in the configuration of this account that has problems in particular?

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Looks like this thread may have some relevance for you too: – Andrew Ferrier Sep 13 '12 at 20:20
who would ever want to visit one of those yucky forum threads? hurts my eyes to look at that. – the0ther May 11 '14 at 4:23
up vote 3 down vote accepted

Are you sure google isn't simply kicking you out after a month or so, because you have to refresh your two factor auth login?

SMTP uses password authentication, and two factor auth sets up your account so that a password alone is not enough to access your account.

I think this is unlikely to be a problem with, and deleting/re-creating the account is a red herring. The real issue is happening on google's server and something else is solving it. Deleting the account in and creating a new one with the same username/password has no impact at all on what data it sends to google's server, so it's impossible for that to solve the problem you're having.

Perhaps if you log into google in safari, go through the two factor auth process, will suddenly start working again? I'm not sure how google's two factor auth uses, I think if you have used two factor auth from that IP address recently, it will accept password-only authentication.

Failing that, you might have better luck on a google specific support forum, or just waiting for it to be fixed (you can't be the only person experiencing this issue).

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It does seem like Google is periodically rejecting the app-specific password, but it's happening every few days, not once a month. I've reset said password and reconfigured the SMTP settings multiple times, and doing so does resolve the issue. Very, very temporarily. – Dan J Sep 18 '12 at 23:45
The app-specific passwords don't work this way, however. They essentially are like regular one-factor passwords, albeit complex and auto-generated. They don't expire unless you explicitly kill them from your Account Settings screen. So it's unlikely this would be the cause of this problem. – Andrew Ferrier Sep 24 '12 at 11:50

I'm doubtful this is your issue, but note that the password for the SMTP server is configured independently from the incoming (IMAP) server. Double-check both are set to a valid app-specific password in's settings.

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Good point, but, yes, I'm setting both the account's IMAP and the associated SMTP passwords to the generated app-specific password. – Dan J Sep 13 '12 at 20:09
Just for others looking through here ... I found this question via Google, and once this answer made me think to double check the smtp server's password, I realized it was empty. Not quite sure how that happened (I don't use 2 factor auth, or anything strange, and it was working before). But once I input my password, all was well with the cosmos :) – Joel Martinez Sep 17 '13 at 14:55

FWIW I've been having this problem with my account since setting up two-factor-auth. I've had to reset my app-specific password for the GMail account on my mac profile several times. The most recent time I actually just needed to restart though.

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Worth checking that you aren't suffering from a Captcha-based issue. See here.

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I have this same problem as of this morning (9/30/15) after upgrading to Yosemite on my Macbook Pro. It worked fine for one day. Can receive but not send as the account is offline. I've tried every tip I've been reading about and nothing is working. I can send emails from my Mac if I go on the internet to The problem is with MacMail.

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