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This page is not comprehensive. Right now, think of it as a place where we put answers to questions that are asked when they are asked. If you know the answer to a question, or think you know, please just update this page! Just put who is answering the question and when they are answering it in parens. If you know there is a bug filed on implementing something, or even a WONTFIX bug, please update the page! Thanks!
Also note that all of these values are based on the code that is in the official Mozilla tree. Actual shipping devices may have altered some constants, although hopefully that's not the case.
=== Sending Attachments ===
* Maximum file aggregate sizeof all attachments:** Future: {{bug|9494981040861}} will raise the sending limit to 25 MiB. This change is targeted at should probably happen in v2.0 (previously named v1.5) 1 but is not guaranteed.** v1.34+: Maximum aggregate size of all attachments is limited to 5 megabytes, but . {{bug|871897982779}} has been fixed the memory-backed blob issues (and other blob issues), so the app is capable of sending much larger attachments without crashing if the limit is relaxedthis should all work quite well.** v1.3, v1.3t: 5 megabytes. (Tests included sending a 29MB videoMemory usage should be reduced from this version onwards because {{bug|871897}} implemented send streaming.) We have not raised the limit because there are still potential Because of {{bug|982779}} large memory issues with downloading large attachments in the e-mail appbacked (as opposed to Device-Storage/IndexedDB file-storage-backed) Blobs may pose a problem, mail servers frequently enforce maximum message size limits, and but the larger the message the larger a chance of a send failureCamera app has been fixed in these releases so no built-in apps have this problem.** v1.1-v1.2: Maximum aggregate size of all attachments is limited to 5 megabytes, memory usage will be high.
** v1.0.1: No size limit, likely to crash on 256MB devices if aggregate attachment size exceeds 5 megabytes.
* Attachment types supported
** Images (image/*): '''YES''', v1.0.1 onwards
** Audio files (audio/*): '''YES''', v1.1 onwards.
** Video fiels files (video/*): '''YES''', v1.1 onwards
** PDF files, other file types: '''NO'''
* Maximum allowed size of a single attachment to be downloaded. Note that per the next point, large message downloads may still crash the email app, depending on device memory!
** v2.0+: 20 MiB. This is nearly no limit. Most mail providers limit mail sizes to 25 MB. We will raise this when we raise the send limit.
** v1.4: no limit
** v1.3t: 1 MiB
** v1.0.1-v1.3: no limit
* Downloading large attachments
** v1.3+: A single huge download may crash the app depending on available device memory. {{bug|871897}} improved our cache management of downloaded attachments, but {{bug|943798}} which is dependent on platform improvements means that single attachment downloads may still cause problems.
** v1.0.1-v1.2: A single huge download or multiple downloads of any size across multiple messages in succession may crash the app if the user does not switch folders or scroll the message list sufficiently to cause the cache to flush the downloaded message.
* Caveats
