In article <c01919bd-a259-7d58-5be6-cfb950f69...@iki.fi> you write: >When sending messages to a *.mail.protection.outlook.com host via IPv6, >our mail host gets the following email status: > >#4.7.26 SMTP; 450 4.7.26 Service does not accept messages sent over IPv6 >[2001:708:10:6004::22] unless they pass either SPF or DKIM validation (message >not signed) (S825). [DB5EUR03FT043.eop-EUR03.prod.protection.outlook.com]
FWIW, Gmail has had the same rule for a long time, all IPv6 mail must be validated with SPF or DKIM, so you're better off fixing whatever is wrong. Do you know what address it's trying to send mail from? It looks to me like your SPF record allows 2001:708:10:6004::22 and ::14 R's, John _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
