[Mailman-Users] Photos from Macs getting removed by list server

[Peter Shute]

We’re finding that messages sent to our list by Mac users are having jpg 
attachments removed. I assume this is something to do with the list being plain 
text only, and the email format created by the mail program Macs use.

We’re also finding that if ipad/iphone users send emails with photos, the list 
lets the photos through, but iPad/iphone users can’t see them, causing them to 
assume they’ve been stripped off.

Evidence for these symptoms is partly anecdotal, so might not be exactly right. 
It’s hard to get information from users about exactly which device and which 
program they used to create the emails. Has anyone else seen the same things? 
Is there any easy fix for them?

Peter Shute

Sent from my iPad
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Re: [Mailman-Users] Photos from Macs getting removed by list server

[Christian F Buser via Mailman-Users]

Hello Peter Shute. On Sun, 21 Jan 2018 08:13:13 +, you wrote:

> We’re finding that messages sent to our list by Mac users are having 
> jpg attachments removed. I assume this is something to do with the 
> list being plain text only, and the email format created by the mail 
> program Macs use.

No, it has nothing to do with "the email format created by the mail program 
Macs use", because these mail programs have to follow the same rules as all 
mail programs do. Otherwise they just would be useless.

I would rather guess that these images were embedded in the mail message’s HTML 
text and not real attachments. And when the HTML is deleted by Mailman, the 
images are of course also no longer showing. 

> We’re also finding that if ipad/iphone users send emails with photos, 
> the list lets the photos through, but iPad/iphone users can’t see 
> them, causing them to assume they’ve been stripped off.

Not sure, but I think this is all a problem between the chair and the keyboard 
of the sender or the recipient... 

Christian 

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[Mailman-Users] Photos from Macs getting removed by list server

[Stephen J. Turnbull]

Peter Shute writes:

 > Evidence for these symptoms is partly anecdotal, so might not be
 > exactly right. It’s hard to get information from users about
 > exactly which device and which program they used to create the
 > emails. Has anyone else seen the same things? Is there any easy fix
 > for them?

If you have access to the host or perhaps through the web interface to
the archives, you can get the "mbox" files.  This is typically in
/var/lib/mailman/archives/private/LIST.mbox/LIST.mbox, where LIST is
the mailbox name (the posting address) for the list.  These contain
full messages, including attachments.

You can read these with a text editor or pager, and should be able to
find the original messages that cause problems.  There will often
be a User-Agent: or X-Mailer: header field which describes the mail
program that composed the message.

There are a number of unusual aspects to mail with Apple devices, I
believe primarily when using Apple's Mail program, and I know that
it's finicky about reading mail.  Specifically, as other replies
mentioned, they like to embed non-text media in HTML rather than
attach them to the mail.  Other than that I can't say much.  It would
help to see examples of failing messages, both in the LIST.mbox format
and as saved in the YEAR-MONTH.txt files (which you can find below
"public" next to the "private" folder, or in the "private" folder for
private lists).

Feel free to either redact identifying information or send any example
messages to me or Mark or both at our personal addresses.  What's
important to solving the problems are the message and part headers,
and the HTML structure.  It's also helpful if the attachments are
undisturbed.

If any of the above makes no sense, feel free to ask for more explicit
instructions.  This stuff is tedious, and Mark and I not only wasted
our youth but much of our adult life learning it.  We wouldn't impose
that on you! :-)

Steve

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Re: [Mailman-Users] too many recipients

[Mark Sapiro]

On 01/21/2018 09:48 AM, Ricardo Kleemann wrote:
> 
> I'm using mailman 2.x with postfix with much trouble. Recently I started
> seeing a lot of errors like this:
> 
> delivery to xxx failed with code 452: 4.5.3 Error: too many recipients
> 
> 
> I do have both mailman and postfix configured for max recipients of 10, so
> I don't understand why there would still be complaints.


Do you mean you have set SMTP_MAX_RCPTS = 10 in mm_cfg.py. That would
limit the maximum number of recipients in one SMTP transaction from
Mailman to Postfix to 10. Other settings such as VERP_DELIVERY_INTERVAL
could reduce that further, but it would never be more.

This doesn't seem to be a Mailman issue, but if I were trying to
diagnose it, I'd look at all the Postfix log entries for such a message,
and I'd also determine if this is a single domain returning this error
or multiple different domains and since it is a 4xx error it should be
retried, and what happens on retry?

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Re: [Mailman-Users] Photos from Macs getting removed by list server

[Carl Zwanzig]

On 1/21/2018 12:13 AM, Peter Shute wrote:

We’re finding that messages sent to our list by Mac users are having jpg 
attachments removed. I assume this is something to do with the list being plain 
text only...


If the list is plain-text only, I'd be more curious how images were making 
their way through, not the reverse.


z!
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[Mailman-Users] too many recipients

[Ricardo Kleemann]

Hello,

I'm using mailman 2.x with postfix with much trouble. Recently I started
seeing a lot of errors like this:

delivery to xxx failed with code 452: 4.5.3 Error: too many recipients


I do have both mailman and postfix configured for max recipients of 10, so
I don't understand why there would still be complaints.


Any suggestions on how else I can further debug this?


thanks

Ricardo
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Re: [Mailman-Users] Photos from Macs getting removed by list server

[Richard Damon]

On 1/21/18 12:30 PM, Carl Zwanzig wrote:

On 1/21/2018 12:13 AM, Peter Shute wrote:
We’re finding that messages sent to our list by Mac users are having 
jpg attachments removed. I assume this is something to do with the 
list being plain text only...


If the list is plain-text only, I'd be more curious how images were 
making their way through, not the reverse.


z! 
For what is normally called a 'plain text only list', yes, I would be 
very surprised to see any pictures. I think it may be possible by 
enabling the HTML -> Text conversion, but NOT filtering out non-text 
sections, you might be able to create a semi-text only list, and in such 
a case, there may be ways to embed an image inline that it gets lost, as 
well as including the image as its own section so it gets through.


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Richard Damon

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Re: [Mailman-Users] Photos from Macs getting removed by list server

[Mark Sapiro]

On 01/21/2018 09:30 AM, Carl Zwanzig wrote:
> On 1/21/2018 12:13 AM, Peter Shute wrote:
>> We’re finding that messages sent to our list by Mac users are having
>> jpg attachments removed. I assume this is something to do with the
>> list being plain text only...
> 
> If the list is plain-text only, I'd be more curious how images were
> making their way through, not the reverse.


Exactly!

In order to say more, we'd need to see all the content filtering
settings for the list and the emails at issue. Ideally, we'd like a raw
email as sent to the list, but even the resultant email from the list
might be helpful.

I.e., for the ideal case, have the user mail to the list with a Bcc: to
you. Then, show us the content filtering settings and both raw emails,
the list mail and the direct Bcc:.

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