`Jan 1 18:42:51 fbeb733d4df9 postfix/submission/smtpd[410]: F3E449CED3: client=unknown[2a01:e11:600c:c330:a049:a883:8557:9cff], sasl_method=PLAIN, sasl_username=support@smtpdomain Jan 1 18:42:52 fbeb733d4df9 postfix/cleanup[413]: F3E449CED3: replace: header Received: from [IPV6:2a01:e11:600c:c330:a049:a883:8557:9cff] (unknown [IPv6:2a01:e11:600c:c330:a049:a883:8557:9cff])??(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)?? key-exchange X2 from unknown[2a01:e11:600c:c330:a049:a883:8557:9cff]; from= to= proto=ESMTP helo=: Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id F3E449CED3??for ; Mon, 1 Jan 2024 18:42:43 +0000 (UTC) Jan 1 18:42:52 fbeb733d4df9 postfix/cleanup[413]: F3E449CED3: message-id= Jan 1 18:42:52 fbeb733d4df9 postfix/qmgr[366]: F3E449CED3: from=, size=578, nrcpt=1 (queue active) Jan 1 18:43:08 fbeb733d4df9 postfix/smtp[414]: warning: no MX host for hotmail.com has a valid address record Jan 1 18:43:08 fbeb733d4df9 postfix/smtp[414]: F3E449CED3: to=, relay=none, delay=24, delays=8.2/0.02/16/0, dsn=4.4.3, status=deferred (Host or domain name not found. Name service error for name=hotmail-com.olc.protection.outlook.com type=AAAA: Host not found, try again) ` hello, as you can see by the log above im having trouble sending emails to hotmail/outlook, do you perhaps know why and could lend me an helping hand?

Is your server IPv6 only? Have you set PTR and SPF records? If you can answer the above questions with yes and it still doesn't work, it may as well not work at all...!? I did a bit of googling and found that Microsoft apparently first introduced IPv6 for their cloud services in October 2022. Since then, it has been gradually extended, but I couldn't find a clear statement saying that IPv6 would work for their email services worldwide as of now. So availability may still vary depending on the region you are in. By the way, I can't find any AAAA records where I am either. So again, I'm not sure if this is supposed to work at all. ``` dig hotmail.com MX ``` ```text ;; ANSWER SECTION: hotmail.com. 3600 IN MX 2 hotmail-com.olc.protection.outlook.com. ``` ``` dig hotmail-com.olc.protection.outlook.com ANY ``` ```text ;; ANSWER SECTION: hotmail-com.olc.protection.outlook.com. 30 IN A 104.47.18.225 hotmail-com.olc.protection.outlook.com. 30 IN A 104.47.18.161 ``` ``` dig hotmail-com.olc.protection.outlook.com AAAA ``` No ANSWER SECTION.

Your server should be working. Question about "from= to=mail@hotmail.com" Is that correct -> mail@hotmail.com?

Name service error for name=hotmail-com.olc.protection.outlook.com type=AAAA

ULLLUPOLLLLO

i have a spf record, but my hosting provider currently has an issue with ipv6 ptr (they’re looking into it should be fixed soon)
and my host is not ipv6 only. do you know if the issue could be caused by the ipv6 ptr record not currently working?

mlcwuser

ULLLUPOLLLLO do you know if the issue could be caused by the ipv6 ptr record not currently working?

No, it doesn’t look like it, but it will definitely cause issues with deliverability in general if no PTR record is in place. Also, a PTR and SPF record is mandatory to send email over IPv6 to recipients who host their own domain on M365. https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/mail-flow-about?view=o365-worldwide#support-for-anonymous-inbound-email-over-ipv6

However, based on the DNS lookups I posted in my previous post and the error messages you posted, it looks like MS has either rolled back IPv6 for hotmail.com and outlook.com, or maybe it was never really available for those domains in the first place.

Or in other words: Your server is trying to connect to hotmail-com.olc.protection.outlook.com via IPv6, but it fails because there are no DNS records for IPv6 in place, probably because MS still does not support IPv6 for all its services, even though it is 2024.

ULLLUPOLLLLO

i have the same problem using ipv4

mailcowdockerized-postfix-mailcow-1 | Jan 4 20:27:23 2d162dff7905 postfix/smtp[409]: 1E4659D45E: to=<mail@hotmail.com>, relay=none, delay=265735, delays=265727/0.03/8.8/0, dsn=4.4.3, status=deferred (Host or domain name not found. Name service error for name=hotmail-com.olc.protection.outlook.com type=A: Host not found, try again)

mailcowdockerized-postfix-mailcow-1 | Jan 4 20:27:23 2d162dff7905 postfix/smtp[413]: 33E889CD48: to=<mail@outlook.it>, relay=none, delay=997, delays=989/0.06/8/0, dsn=4.4.3, status=deferred (Host or domain name not found. Name service error for name=eur.olc.protection.outlook.com type=A: Host not found, try ag ain)
mlcwuser

ULLLUPOLLLLO

hello someone has the same issue?

esackbauer

Seems like a problem with DNS resolution. Have you tried dig from inside the postfix container?

ULLLUPOLLLLO

esackbauer

root@mail:/opt/mailcow-dockerized# docker exec mailcowdockerized-postfix-mailcow-1 dig outlook.it

; <<>> DiG 9.16.44-Debian <<>> outlook.it
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 19029
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
;; QUESTION SECTION:
;outlook.it. IN A

;; ANSWER SECTION:
outlook.it. 3517 IN A 204.79.197.210

;; Query time: 0 msec
;; SERVER: 127.0.0.11#53(127.0.0.11)
;; WHEN: Sun Jan 21 17:08:29 GMT 2024
;; MSG SIZE rcvd: 55

root@mail:/opt/mailcow-dockerized#

root@mail:/opt/mailcow-dockerized# docker exec mailcowdockerized-postfix-mailcow-1 dig eur.olc.protection.outlook.com

; <<>> DiG 9.16.44-Debian <<>> eur.olc.protection.outlook.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 58814
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;eur.olc.protection.outlook.com. IN A

;; Query time: 4000 msec
;; SERVER: 127.0.0.11#53(127.0.0.11)
;; WHEN: Sun Jan 21 17:09:18 GMT 2024
;; MSG SIZE rcvd: 48

root@mail:/opt/mailcow-dockerized#

let me know if you need anything else

Sub-7

@“ULLLUPOLLLLO”

can you tell us your domain?
or PM me.

ULLLUPOLLLLO

ilarity.net
mail.ilarity.net smtp server host

Sub-7

Your server should be working.
Question about “from=<support@smtpdomain> to=mail@hotmail.com”
Is that correct -> mail@hotmail.com?

ULLLUPOLLLLO

Sub-7
sorry i don’t really get what you mean
but if you’re asking if the receiver mail is correct, yes it is, ima unable to send emails to microsoft (outlook and hotmail)

Sub-7

I doubt that mail@hotmail.com exists.
It says in your first post: “warning: no MX host for hotmail.com has a valid address record”

ULLLUPOLLLLO

Sub-7
i just decided to censor it as i said the non-censored email exist

ULLLUPOLLLLO

@esackbauer
let me know how to proceed

ULLLUPOLLLLO

https://docs.mailcow.email/manual-guides/Unbound/u_e-unbound-fwd/
was the solution

readev

“v=spf1 ip4:XX.XX.XX.XX ip6:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX _all”

use spf like this