Which ESP is the most flexible?

[rayx]

Which ESP works well with every VPS and other what nots?

[danni]

I am not following you here, Or maybe I am understanding this wrong.

Most of the VPS goes with any ESP you don't have to worry about. Zohomail, GetResponse, aweber all the most reputable ESP has separate support teams just for migration and to handle account changing situations.

[supaul]

I don't get the purpose of this thread. But I will say this that any paid ESP is capable.

[rayx]

I don't get the purpose of this thread. But I will say this that any paid ESP is capable.

 Many of the VPS providers don't comply.