I’ve try exim and postfix. Both log connectinon timeout and network unreachable error. ul 28 10:56:18 ht-by-sakurami postfix/cleanup[7369]: E10372F524F: message-id=20210728105618.E10372F524F@domain.com Jul 28 10:56:18 ht-by-sakurami postfix/qmgr[7129]: E10372F524F: from=user@domain.com, size=344, nrcpt=1 (queue active) Jul 28 10:56:02 ht-by-sakurami postfix/smtp[7373]: connect to gmail-smtp-in.l.google.com[142.250.153.26]:25: Connection timed out Jul 28 10:56:02 ht-by-sakurami postfix/smtp[7373]: connect to gmail-smtp-in.l.google.com[2a00:1450:4013:c16::1a]:25: Network is unreachable Jul 28 10:56:02 ht-by-sakurami postfix/smtp[7373]: connect to alt1.gmail-smtp-in.l.google.com[2a00:1450:4010:c1c::1a]:25: Network is unreachable
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