XF 1.4 i have a lot of server-error

These all appear to point to communication errors with your SMTP server. It's hard to say whether it's an issue on their end, your end, or the network between both ends.
 
Unfortunately it's a connectivity issue, so there isn't anything that can be done within XF. At best, you could switch to a different SMTP server or use the default PHP mailing method; otherwise, you'd be at the mercy of your current SMTP provider.
 
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