I am having trouble sending mail to GMail accounts, and I'm getting
inconsistent explanations. I could use some help figuring out the real
cause.
Setup: I have a mail server running on Linode running
postfix/dovecot/clamav/etc ( I successfully moved mail off my home
server about a year ago). I have Verizon FIOS at home. I use
Thunderbird for email on my main Linux computer.
When I send email to a gmail account, I am getting:
host aspmx.l.google.com[2607:f8b0:400d:c0e::1a] said:
550-5.7.1 [2600:3c03::f03c:91ff:fe62:5ea] Our system has detected
that this
550-5.7.1 message does not meet IPv6 sending guidelines regarding PTR
records 550-5.7.1 and authentication. Please review 550-5.7.1
https://support.google.com/mail/?p=IPv6AuthError for more information 550
The link that goes to HAS ABSOLUTELY NOTHING to do with IPv6, it has to
do with bulk emails. What I *THINK* it means is I need to set up IPv6
records, but I'm not sure which ones.
But then I do MORE googling about that error message, and some pages say
550-5.7.1 *IS* about spamming and blocklists and this has absolutely
nothing to do with IPv6.
According to
https://mxtoolbox.com/SuperTool.aspx?action=blacklist%3athekramers.net&run=toolpage
my IP address is on the SORBS DUHL list and the Spamhaus ZEN list.
Digging into Sorbs and https://www.spamhaus.org/pbl/query/PBL1637778 I
get the impression my whole IP range is blocked because outgoing mail
should go to smtp.verizon.net when I'm at home. But if that's the case
how does sent mail get saved to my IMAP server?? Is it sent there too?
I had trouble getting Thunderbird to send through vzn even when I set it
to the default, so I deleted all other SMTP servers including my Linode
server. When I try to send through VZN now, I get "An error occurred
while sending mail. The mail server responded: Requested mail action not
taken: mailbox unavailable. Please verify that your email address is
correct in your account settings and try again" In the few Verizon FIOS
pages I could find that talk about sending mail, there's no mention of
username (like
https://www.verizon.com/support/consumer/email/settings/RK=2/RS=_dFiIjDkw9mkm81gv5I6vDDm9ww-
)
So should I be sending mail through smtp.verizon.com or through my
Linode server?
If I'm sending mail through my Linode server, then why would a block on
my home IP address range matter when my MX records point to my Linode
server?
Does this have anything to do with IPv6?
Thanks.
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