On 28.04.21 22:24, sashk wrote:
  They respond with following code on connect:
   
  (host mxb-00306701.gslb.pphosted.com[67.231.145.123] refused to talk to
  me: 554 Blocked - see
  [1]https://ipcheck.proofpoint.com/?ip=XXX.XXX.XXX.XXX

either you are blacklisted or they don't provide the service.

123.145.231.67.in-addr.arpa domain name pointer mx0a-00306701.pphosted.com.

Are you sure it's their outgoing mailserver, not incoming one?

  $ nc -v 67.231.145.123 25
  Connection to 67.231.145.123 25 port [tcp/smtp] succeeded!
  554 Blocked - see [2]https://ipcheck.proofpoint.com/?ip=XXX.XXX.XXX.XXX

are you sure you are supposed to send mail to outside through port 25?

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