[bug]: Images load slowly

[SimplyCorbett]

What happened?

When sending images to someone and then loading them on apple mail, images load very slowly and require repeated clicks of “download” before they finally load up.

I have not seen this behavior on any other email service.

I am using a postgresql backend for everything.

How can we reproduce the problem?

1. Send large 3MB HEIC photos

2. Try loading them with apple mail on ipad/iphone.

Version

v0.11.x

What database are you using?

PostgreSQL

What blob storage are you using?

PostgreSQL

Where is your directory located?

Internal

What operating system are you using?

Linux

Relevant log output

Code of Conduct

• I agree to follow this project's Code of Conduct

[mdecimus]

Apple downloads the entire message contents and then proceeds to display its message parts.
Set the log level to trace and check the Stalwart logs if you believe it is a timeout on the Stalwart side.

[johansmitsnl]

I'm seeing these errors in the logs while the iOS client tries to download the attachment:

2025-01-29T17:06:17Z DEBUG IMAP error occurred (imap.error) listenerId = "imap", localPort = 143, remoteIp = xxx.xxx.xxx.xxx, remotePort = 50704, details = "Missing command after tag "Su/", found CRLF instead.", type = BAD, code = PARSE
2025-01-29T17:06:17Z TRACE Raw IMAP output sent (imap.raw-output) listenerId = "imap", localPort = 143, remoteIp = xxx.xxx.xxx.xxx, remotePort = 50704, size = 68, contents = "* BAD [PARSE] Missing command after tag "Su/", found CRLF instead.\r\n"

[mdecimus]

What would really help is if you can provide the IMAP command that was sent by the client to see why parsing failed.

[johansmitsnl]

I send by chat 2 log traces. It contains personal details so that why I didn't shared it here.

If you need more logging please let me know. I also saw with large html e-mails (don't have a log of it) that each time you open the email more got loaded and after opening it (in that specific case) 5 times the whole e-mail was loaded. It seems like not all parts (looks like it is chunked) where send to the e-mail client?

[johansmitsnl]

@SimplyCorbett the commit 54733de0ff353ca7c77bedce030761283eec9ccc solves the issue with the slow loading images.