Corrupted links in emails

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dadamail
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Posts: 33
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Re: Corrupted links in emails

Post by dadamail » Thu Oct 01, 2020 6:20 pm

sendmail is a command line utility to... send mail. How it works is sort of a black box, but it could inject a message straight into the mail queue, which would be sent out by the mail server (via SMTP), or something similar. It generally doesn't do any encoding or such.

This sounds like an issue with your mail server, and not Dada Mail then, unless the manipulation of the message is happening before being passed to the mail server, which I'm not feeling it is? If the manipulation is happening before messages are being passed to the mail server, I'll look at things. You can set Dada Mail to send just to a file with this config:

Code: Select all

$MAILPROG 			= '/path/to/a/test/file.txt; 
$MAIL_SETTINGS      = ">$MAILPROG";
$MASS_MAIL_SETTINGS = ">$MAILPROG";
I'd really would need the entire SOURCE of the email message you send out (a simple as you can make it) and the entire email message SOURCE you receive.

If you're sending a message with lines measured in the thousands, you're sending a message without any proper encoding. Can't comment on the php mail() command - Dada Mail is written in Perl, so wouldn't be using that.
Justin J
Creator, Dada Mail

SIVC
Posts: 16
Joined: Thu May 14, 2020 11:06 am

Re: Corrupted links in emails

Post by SIVC » Fri Oct 02, 2020 8:36 am

As suggested I captured as a file the output dadamail would have sent to sendmail (emailed file direct to Justin)
The data has been split into lines of 75 characters from submitted code followed by an "=" (I guess this is Quoted-Printable format).
Significantly I can see that when the 1st character of a line is a "." corresponds exactly to the errors I previously saw in received emails.

I've done a bit of googling and now realise the problem I've been having is not unknown.
e.g. https://stackoverflow.com/questions/298 ... n-new-line.

It seems SMTP servers delete a single leading dot, so if this is intended the dot needs to be doubled up.
What I'm not clear about is whether this should happen in dadamail or in the sendmail implementation used by my hosting provider, Ionos.

SIVC
Posts: 16
Joined: Thu May 14, 2020 11:06 am

Re: Corrupted links in emails

Post by SIVC » Fri Oct 02, 2020 11:15 am

Found another conversation about "smtp-dot-stuffing-when-and-where-to-do-it" on stackoverflow
https://stackoverflow.com/questions/152 ... 1#16033781

There is suggestion that all SMTP servers do not behave the same, but that a solution is:-
"The practical answer: If you're using quoted printable format then always translate a dot to =2E. You can't rely on all smtp servers doing the dot removal correctly."

User avatar
dadamail
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Posts: 33
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Re: Corrupted links in emails

Post by dadamail » Fri Oct 02, 2020 9:31 pm

If sending via SMTP, Dada Mail (or the Net::SMTP module that Dada Mail uses to send via SMTP) replaces a lone dot on a line with,

Code: Select all

=2E
.

For example,

Code: Select all

Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline
MIME-Version: 1.0
Subject: Test


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Justin J
Creator, Dada Mail

User avatar
dadamail
Site Admin
Posts: 33
Joined: Fri Nov 29, 2019 10:47 pm
Contact:

Re: Corrupted links in emails

Post by dadamail » Fri Oct 02, 2020 9:34 pm

Decoded:

Code: Select all

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Justin J
Creator, Dada Mail

SIVC
Posts: 16
Joined: Thu May 14, 2020 11:06 am

Re: Corrupted links in emails

Post by SIVC » Fri Oct 02, 2020 10:47 pm

Thanks for reply - nice demo.
So if single dot is already being replaced by =2E in SMTP method, that would explain why I don't see missing dots with that method.
Please could single dot to =2E also be applied to sendmail method - I expect that would cure the problem I'm seeing?

User avatar
dadamail
Site Admin
Posts: 33
Joined: Fri Nov 29, 2019 10:47 pm
Contact:

Re: Corrupted links in emails

Post by dadamail » Sat Oct 03, 2020 3:59 am

It'll be this for ALL methods. Dada Mail uses the MIME::Entity module to create all the email messages it creates. Here's a one-liner that shows that a single dot and newline will create the correct encoding:

Code: Select all

perl -MMIME::Entity -e 'print MIME::Entity->build(Encoding => "quoted-printable", Data     => ".\n")->as_string;'
Prints,

Code: Select all

Content-Type: text/plain
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-Mailer: MIME-tools 5.505 (Entity 5.505)

=2E
Justin J
Creator, Dada Mail

SIVC
Posts: 16
Joined: Thu May 14, 2020 11:06 am

Re: Corrupted links in emails

Post by SIVC » Sat Oct 03, 2020 10:10 pm

The test case for the errors I've seen would be something like Data => "\n.abc"
i.e. a line starting with a single dot followed by other characters.
Does the dot in this case also get converted to "=2E"?

SIVC
Posts: 16
Joined: Thu May 14, 2020 11:06 am

Re: Corrupted links in emails

Post by SIVC » Sat Oct 03, 2020 10:35 pm

Just worked out how to run a perl snippet on command line (I admit to knowing very little about perl) and tried myself - unfortunately it looks like it doesn't convert a dot at beginning line followed by other character to =2E, so I don't think it will solve the problem I'm seeing.

~$ perl -MMIME::Entity -e 'print MIME::Entity->build(Encoding => "quoted-printable", Data => "xyz\n.abc\n.\n")->as_string;'
Content-Type: text/plain
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-Mailer: MIME-tools 5.509 (Entity 5.509)

xyz
.abc
=2E
~$

~$

SIVC
Posts: 16
Joined: Thu May 14, 2020 11:06 am

Re: Corrupted links in emails

Post by SIVC » Sun Oct 04, 2020 4:24 pm

Now I have a file of the Dadamail output which would normally go to sendmail, I've used command-line to submit it to sendmail (to prove I could, and that the errors were still present by this method), then I modified this Dadamail output file using a text editor to replace '\n.' with '\n=2E' (4 replacements). I then used command line to submit to sendmail and this time the errors in received email had disappeared.

(uiserver):u7777777:~/richard$ /usr/sbin/sendmail xxyyy@live.com <file_from_sendmail_33_fix.txt

I've also tried passing my synthesised_testcase file through MIME::Entity using same command-line as in my previous post (but with much larger string) and shown that this alone will not solve the problem we've been seeing - some lines could still start with a dot followed by other characters.

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