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feat: increase sys.msgsize_max_recommended to match chatmail message size limit

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This also affects maximum number of webxdc updates attached to the message.
This commit is contained in:
link2xt
2026-09-10 09:13:53 +00:00
committed by l
parent 51b6d50a22
commit 58b5f5d0f4
2 changed files with 14 additions and 5 deletions
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2
deltachat-rpc-client/tests/test_webxdc.py
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@@ -21,7 +21,7 @@ def test_webxdc(acf, rpcdata) -> None:
"isAppSender": False,
"isBroadcast": False,
"sendUpdateInterval": 1000,
"sendUpdateMaxSize": 18874368,
"sendUpdateMaxSize": 2**20 * (30 - 1) * 3 // 4,
}
status_updates = message.get_webxdc_status_updates()

17
src/mimefactory.rs
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@@ -40,10 +40,19 @@ use crate::stock_str;
use crate::tools::{IsNoneOrEmpty, create_outgoing_rfc724_mid, remove_subject_prefix, time};
use crate::webxdc::StatusUpdateSerial;
// attachments of 25 mb brutto should work on the majority of providers
// (brutto examples: web.de=50, 1&1=40, t-online.de=32, gmail=25, posteo=50, yahoo=25, all-inkl=100).
// to get the netto sizes, we subtract 1 mb header-overhead and the base64-overhead.
pub const RECOMMENDED_FILE_SIZE: u64 = 24 * 1024 * 1024 / 4 * 3;
/// Maximum attachment file size.
///
/// This is used to limit the size of attached webxdc updates.
/// This constant is also available to UIs via sys.msgsize_max_recommended config
/// and is used when encoding video files. UIs may refuse to attach files larger than this size.
///
/// 30 MiB is the default maximum file size for chatmail relays as of 2026-09-10.
/// Attachments of 25 mb brutto should work on the majority of providers
/// (brutto examples: web.de=50, 1&1=40, t-online.de=32, gmail=25, posteo=50, yahoo=25, all-inkl=100).
///
/// To get the netto sizes, we subtract 1 MiB overhead for headers
/// and divide by 4/3 to account for base64 encoding.
pub const RECOMMENDED_FILE_SIZE: u64 = (30 - 1) * 1024 * 1024 / 4 * 3;
#[derive(Debug, Clone)]
#[expect(clippy::large_enum_variant)]