PROBLEM: Outlook.com web app (OWA), synchronized with my local server via IMAP and SMTP(STARTTLS), returns "Undeliverable message" for all messages sent.
PROPOSAL: (rejected) This returning message points the issue comes up with the SPF and sugests updating DNS entry with a dynamic IP xx.xxx.xx.xxx A dynamic IP??? Nope.
PROPOSAL: (not working) Mocosoft sugests updating SPF entry with this entry ip4:23.103.224.0/19 ip4:206.191.224.0/19 ip4:40.103.0.0/16 include:spf.protection.outlook.com Working? Nope.
This was the "undeliverable message" received.
Technical details InvalidRecipientsException: Invalid recipients were provided for the message: '[email protected]' (550 5.7.23 : Recipient address rejected: Message rejected due to: domain owner discourages use of this host. Please see http://www.openspf.net/Why?s=mfrom;[email protected];ip=40.101.102.85;r= ). --> Respuesta del servidor SMTP inesperada. Esperado: 250, real: 550, respuesta completa: 550 5.7.23 : Recipient address rejected: Message rejected due to: domain owner discourages use of this host. Please see http://www.openspf.net/Why?s=mfrom;[email protected];ip=40.101.102.85;r=
Failure code: 8f93