dovecot - Jun 2020 - Dovecot /VMWare Boxer

Hello all,

My name is Djule Djukic and I am working for Hipotekarna Banka from 
Montenegro.
We are using IMAP email server Dovecot version 2.1.17. As a email 
clients on our corporate workstations we are using Thunderbird or 
WebMail and everything is working fine.

We decided to introduce MDM solution in our environment and we installed 
VMWare WorkspaceOne (former Airwatch) which use Boxer as a mail client 
in App per VPN scenario.
When we syncronise email with? Boxer? we have found that the time and 
date displayed for some messages? have been changed to the time at which 
the file was synchronized.

This is not hapening with all messages. It is happening only with 
messages in subfolders, never with Inbox.
It seems when messages is moved by some rule from WebMail or Thunderbird 
from Inbox to some subfolder, Boxer is not able to read dates correctly,

By seraching on Internet we found couple of explanation what might be 
possibel cause of this behaviour.
https://imapsync.lamiral.info/FAQ.d/FAQ.Dates.txt
https://serverfault.com/questions/588618/maintain-email-timestamp-when-transferring-between-email-servers-using-an-email
https://dovecot.org/pipermail/dovecot/2008-July/032165.html

Problem with some email clients is that they not look always for
"Date:"
from email message header. The "Date:" header is usually the date the 
message was written or sent the first time, at the writer side.
This "Date:" header line is never changed by any transfer or copy.
If an email client uses the "Date:" header for displaying the date of
a
message then no problem in synchronization with wrong date should arise. 
Obviously this is not a case with a Boxer email application.
We tried GMail and everything is working fine.

We are wondering if someone can explain what APPEND command could have 
done in our case? Is it relevant at all for our case? Is it used somehow 
by thunderbird or webmail clients?
Also we would like to hear from someone if there are some improvemnents 
in further release of dovecot or some configuration that we can 
implement in order to fix this?

Thank you in advanced for your suggestions and contribution,
?

?ule ?uki?

Specijalista za informacionu bezbjednost / ISO
?

?ule?uki?

Specijalistaza informacionu bezbjednost / ISO

http://www.hipotekarnabanka.com/hb-content/uploads/2014/06/slika1.jpg

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> On 11. Jun 2020, at 16.46, Djule Djukic <djule.djukic at hb.co.me>
wrote:
> 
> 
> Hello all,
> 
> My name is Djule Djukic and I am working for Hipotekarna Banka from
Montenegro.
> We are using IMAP email server Dovecot version 2.1.17. As a email clients
on our corporate workstations we are using Thunderbird or WebMail and everything
is working fine.
This dovecot version is 7 years old already. Can you upgrade?
> 
> We decided to introduce MDM solution in our environment and we installed
VMWare WorkspaceOne (former Airwatch) which use Boxer as a mail client in App
per VPN scenario.
> When we syncronise email with  Boxer  we have found that the time and date
displayed for some messages  have been changed to the time at which the file was
synchronized.
I have no idea how does this "Boxer mail client app" fetch message
date.

Can you record some imap rawlogs to find out if it uses IMAP FETCH to get the
message INTERNALDATE or does it really try to parse it from mail headers?

https://wiki.dovecot.org/Debugging/Rawlog
<https://wiki.dovecot.org/Debugging/Rawlog>
> Problem with some email clients is that they not look always for
"Date:" from email message header. The "Date:" header is
usually the date the message was written or sent the first time, at the writer
side.
> This "Date:" header line is never changed by any transfer or
copy.

They do not rely on Date header. Date header is not mandatory and also it's
not written on server side. It is written by the sender.

Sami

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* Sami Ketola:
> They do not rely on Date header. Date header is not mandatory and also
> it's not written on server side. It is written by the sender.
Could you please elaborate on "Date header is not mandatory"? As far
as
the message format goes, "Date" and "From" are actually the
two required
headers in every message (see RFC 5322), so I am not quite sure what you
mean?

-Ralph