Hello and thank you for your reply.
Here are the answers to your questions:
1. Your MTA logs probably have clues - with the reasons for the
bounce(s). I'd love to see what the recipient servers think.
Here some sample about the bounces. Sorry but for privacy I hid the email
name but left the domain
<x...@cfwb.be>: host seg-02.etnic.be[193.53.34.104] said: 550 #5.7.1
DMARC unauthenticated mail is prohibited. (in reply to end of DATA
command)
<x...@bmbwf.gv.at>: host smtp01.noc-science.at[144.65.134.41] said:
554 5.7.1 This email from IP 185.224.197.180 has been rejected. The
email
message was detected as spam. (in reply to end of DATA command)
<x...@ext.mesr.etat.lu>: host incoming-1.mail.etat.lu[185.106.25.64]
said: 550 #5.7.1 DMARC unauthenticated mail is prohibited. (in reply to
end
of DATA command)
<x...@msmt.cz>: host jarilof.msmt.cz[195.113.76.11] said: 554 5.7.1
This email from IP 185.224.197.180 has been rejected. The email message
was
detected as spam. (in reply to end of DATA command)
<x...@ufm.dk>: host mx7.sitnet.dk[188.64.157.7] said: 550 #5.7.1 DMARC
unauthenticated mail is prohibited. (in reply to end of DATA command)
<x...@mp.gov.me>: host
primary.us.email.fireeyecloud.com[3.93.93.44] said: 550 5.7.26 ETP205
DMARC
Failure for domain (<qqi.ie>) -
3yPiBJU-67053-09423C05683CD7BFB463fd19b7b
(in reply to end of DATA command)
<x...@ufm.dk>: host mx5.sitnet.dk[188.64.157.5] said: 550 #5.7.1 DMARC
unauthenticated mail is prohibited. (in reply to end of DATA command)
<x...@nzqa.govt.nz>: host nzqasmtp.nzqa.govt.nz[163.7.134.150] said:
550 5.7.1 rejected by DMARC policy for qqi.ie (in reply to end of DATA
command)
1. DO you DKIM-sign the list emails and have DMARC mitigation.
Yes, we do.
1. Do you have SPF records published?
Yes, we do.
1. Do you have stats on the bounces?
Unfortunately I haven’t a stats but only the mail archive. I don't know if
there is a feature in Mailman that lets me see bounce statistics.
We done some test with mailtester.com, below the results.
https://www.mail-tester.com/test-92yqfu796
Thank you,
Florin Pasăre,
On Mon, Jul 31, 2023 at 6:55 PM Odhiambo Washington <odhia...@gmail.com>
wrote:
>
>
> On Mon, Jul 31, 2023 at 6:23 PM Florin Pasăre <fpas...@gmail.com> wrote:
>
>> Hello,
>> I've been having some issues lately. We are using Mailman 2.1.15.
>> I've looked over the FAQ but the only thing that I could find is to
>> contact
>> the ISPs and ask to be whitelisted - am I understanding this correctly?
>> Here is a brief description of the issue:
>>
>> Our server hosts 5 listserv, the biggest one counts over 530 subscribed
>> members from 55 different countries.
>>
>>
>>
>> We had received sporadic bounces triggered by emails sent to these lists
>> since the install of the server in 2016, but in the last months the number
>> of bounces we get has increased. We receive these bounce notifications
>> informing us that the given *subscription has been disabled* due to
>> *excessive
>> or fatal bounces *(up to around 30 bounce notifications triggered by a
>> single email sent to one of the listservs). Every time we get such
>> notifications, we untick the bounce under “nomail [reason]" in the admin
>> management site for each of the email addresses that haven been disabled
>> by
>> the system.
>>
>>
>>
>> Furthermore, it has happened several times in the past few months that a
>> number of email addresses have been automatically removed from the
>> listservs (at the same time, from different countries). We have not found
>> an explanation for why this happens or a solution, so the only thing we
>> are
>> able to do is to manually add them back to the listservs.
>>
>>
>>
>> We have also asked these colleagues for which we have received bounces to
>> check whether there is anything blocking the listservs’ emails from their
>> side (note that many of them work in ministries or agencies with strong
>> security features), and to add the server IP to the white list, but the
>> problem persists.
>>
>>
>> Thank you for your time,
>>
>>
>> Florin Pasăre,
>>
>
> In summary:
>
> 1. Your MTA logs probably have clues - with the reasons for the bounce(s).
> I'd love to see what the recipient servers think.
> 2. You have not mentioned if you DKIM-sign the list emails and have DMARC
> mitigation.
> 3. Do you have SPF records published?
> 4. Do you have stats on the bounces?
>
>
> --
> Best regards,
> Odhiambo WASHINGTON,
> Nairobi,KE
> +254 7 3200 0004/+254 7 2274 3223
> "Oh, the cruft.", egrep -v '^$|^.*#' ¯\_(ツ)_/¯ :-)
> [How to ask smart questions:
> http://www.catb.org/~esr/faqs/smart-questions.html]
>
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