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Hi Stoiko, Thank you so much for your help so far. This is the total of the syslog message for a specific email: Oct 25 19:37:20 mail postfix/postscreen[31559]: CONNECT from [66.x.x.x]:2645 to [192.x.x.x]:25 Oct 25 19:37:20 mail postfix/postscreen[31559]: PASS OLD [66.x.x.x]:2645 Oct 25...

Hi, Thanks for the response. To be clear I don't think this is really a problem with PMG, I think it's a few sending servers that don't handle the expired original DST Root CA X3 certificate well. However, this appears to be very similar to what we had with iPhones connecting to Exchange...

Hi, I have a problem receiving emails from a small number of servers, no emails make it through and i get the following message in the syslog: warning: TLS library problem: error:14094415:SSL routines:ssl3_read_bytes:sslv3 alert certificate expired:../ssl/record/rec_layer_s3.c:1543:SSL alert...