These aren't friend delivery issues, these are tcpip/network faults/timeouts, or something else odd going on.   It's hard to be sure if it's even a problem at your end, ideally you need to try sending a message yourself of similar size from similar source and see if you can reproduce the problem.

ChrisP.

I am seeing delivery failures since my server failed and I “promoted” the mirror to MASTER. Both have been on my Friends list for years and still are on the former mirror.

Any ideas what may be causing these delivery failures?

 9 00:38:59.00 [903] Rejected 209.85.192.193 <someone@gmail.com> <john@wilkes.com> 1135416 <CANATcHeYcji=fnnRqu5RyN6kzLwsCN1qtDBTbkfH70H07QUdpQ@mail.gmail.com> "[209.85.192.193] tcp_read_dot 1171 1159 seconds, got 1134876 bytes (Connection reset by peer LastBytes (SMvC))"
 9 03:03:52.00 [916] Rejected 74.125.83.67 <someone@gmail.com> <john@wilkes.com> 1419808 <CANATcHeYcji=fnnRqu5RyN6kzLwsCN1qtDBTbkfH70H07QUdpQ@mail.gmail.com> "[74.125.83.67] tcp_read_dot 1711 1699 seconds, got 1419276 bytes (Err Code Zero LastBytes (63ge))"

 8 08:18:06.00 [621] Rejected 74.125.83.67 <someone@gmail.com> <john@wilkes.com> 1975088 <CANATcHeYcji=fnnRqu5RyN6kzLwsCN1qtDBTbkfH70H07QUdpQ@mail.gmail.com> "[74.125.83.67] Shutting down"
 8 19:37:15.00 [859] Rejected 74.125.83.68 <someone@gmail.com> <john@wilkes.com> 1794539 <CANATcHeYcji=fnnRqu5RyN6kzLwsCN1qtDBTbkfH70H07QUdpQ@mail.gmail.com> "[74.125.83.68] tcp_read_dot 1170 1169 seconds, got 1794084 bytes (Connection reset by peer LastBytes (aBgN))"
 8 22:29:28.00 [886] Rejected 74.125.83.65 <someone@gmail.com> <john@wilkes.com> 600568 <CANATcHeYcji=fnnRqu5RyN6kzLwsCN1qtDBTbkfH70H07QUdpQ@mail.gmail.com> "[74.125.83.65] tcp_read_dot 1029 1017 seconds, got 600036 bytes (Err Code Zero LastBytes (QiCi))"

 7 16:08:11.00 [351] Rejected 74.6.129.43 <someone@yahoo.com> <john@wilkes.com> 2025196 <2070331634.2138187.1515364224134@mail.yahoo.com> "[74.6.129.43] tcp_read_dot 1145 1133 seconds, got 2024660 bytes (Connection reset by peer LastBytes (QFE7))"
 7 16:46:46.00 [364] Rejected 74.6.129.83 <someone@yahoo.com> <john@wilkes.com> 1013694 <2070331634.2138187.1515364224134@mail.yahoo.com> "[74.6.129.83] tcp_read_dot 1119 1107 seconds, got 1013156 bytes (Connection reset by peer LastBytes (PGZe))"
 7 17:14:02.00 [371] Rejected 74.6.129.41 <someone@yahoo.com> <john@wilkes.com> 1090844 <2070331634.2138187.1515364224134@mail.yahoo.com> "[74.6.129.41] tcp_read_dot 1122 1110 seconds, got 1090308 bytes (Connection reset by peer LastBytes (6eiS))"
 7 19:00:44.00 [412] Rejected 74.6.129.83 <someone@yahoo.com> <john@wilkes.com> 1492158 <2023313357.2237878.1515376134146@mail.yahoo.com> "[74.6.129.83] tcp_read_dot 1151 1150 seconds, got 1491684 bytes (Connection reset by peer LastBytes (pkgb))"