Rackspace server stopped sending emails
When I type 'mailq' in putty,I got follwing error :
Delivery temporarily suspended: SASL authentication failed; Server smtp.mailgun.org[ipaddress] said: 535 5.7.0 Message limit reached.
Whats the issue? How can I resolve it?
I'm a Racker, and we see this issue quite a bit. Mailgun allows you to demo the service by sending up to 300 emails from a 'sandbox' account. Once you've hit those, you need to register a domain, and then the daily limit of 300 emails is lifted, and as a Rackspace customer you'll have a new limit of 50,000 free emails per month before you hit the next limit. After that you'll need to enter some sort of payment information and the sky's the limit.
We have a good article on setting up Mailgun in the Rackspace Community, but the TL;DR is you just need to add the domain, then add a DNS TXT record to prove ownership.