Email suddenly not working?

[a.com]

I have no idea what is going on, but suddenly email is not working.

[a.com]

I didn’t update to 1.5 or update my email package (knowingly) but had email give out on me anyway… some answers below

Email doesn't work after update to 1.5

Yeah, that’s helped. Thanks, man. I’m just wondered why it was working yesterday and stopped working today?

Galaxy send email suddenly stopped working with Mailgun SMTP

I am having this issue with Meteor Meteor 1.4.4.1 using Mailgun and smtp. First several emails send and then they just stop sending. Re-deploy or container kill and they start sending again… and then stop.