Hi Oliver > As far as I know Microsoft never officially supported or advertised STARTTLS > for its mail submission services. Given that RFC8314 "Use of Transport Layer > Security for Email Submission and Access" basically deprecates STARTTLS in > favor of implicit TLS for submission services, I wouldn't expect that > STARTTLS is coming back if it's currently broken. > Maybe Michael Wise can shed some more light on this.
They definitely advertise STARTTLS as a supported CAPABILITY, check yourself: $ telnet outlook.office365.com 143 Trying 2603:1026:c0b:1c::2... Connected to outlook.office365.com. Escape character is '^]'. * OK The Microsoft Exchange IMAP4 service is ready. [WgBSADAAUAAyADcAOABDAEEAMAAwADIAOAAuAEMASABFAFAAMgA3ADgALgBQAFIATwBEAC4ATwBVAFQATABPAE8ASwAuAEMATwBNAA==] . CAPABILITY * CAPABILITY IMAP4 IMAP4rev1 LOGINDISABLED STARTTLS SASL-IR UIDPLUS ID UNSELECT CHILDREN IDLE NAMESPACE LITERAL+ . OK CAPABILITY completed. Mit freundlichen Grüssen -Benoît Panizzon- -- I m p r o W a r e A G - Leiter Commerce Kunden ______________________________________________________ Zurlindenstrasse 29 Tel +41 61 826 93 00 CH-4133 Pratteln Fax +41 61 826 93 01 Schweiz Web http://www.imp.ch ______________________________________________________ _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
