[nuschk]

Same here. Had a chat with the support team and they say they had to allocate a number of new IPs, since some of their existing IPs were blacklisted. Now they need to warm up the new ones first, which may take an undefined amount of time.

Support was very helpful and migrated our traffic to already warmed up IPs.

[mrw34]

Same experience here - we were migrated without warning 3 days ago and the majority of outgoing messages were subsequently deferred for 12 hours or more. When we reported the issue we were basically told they would be delivered eventually. No offer to migrate our traffic or to compensate us in any way.

[DanitaBaires]

We filed a support ticket and also had our traffic moved to a new IP, but I had to write to their Twitter account for them to pay attention. I urge everybody with an Essentials plan to do this, because it seems that if you don't complain on any channel possible you'll stay on this situation until it passes which can be "a few days" as they say.

[selckin]

what does warm up mean in this context?

[crazypyro]

I'd assume its a process of slowly ramping up new IP addresses to send out emails. If you take an IP and instantly use it on a massive scale, I'm sure it triggers a lot of spam filters.