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Update to that version, but now it gives me that error and does not send the emails. Is not a new installation, it is a version update

2017/04/18 01:19:02 [error] [application] Cannot find a valid server to send the campaign email, aborting until a delivery server is available!
2017/04/18 01:19:02 [error] [application] The server type smtp requires following functions to be active on your host: proc_open or popen!

Validate the reference for these cases, link.


6) We have the same php versions