Private saved message won't send on Desktop and Mobile

[AdrienDSlone]

Hello DeltaChat team,

I met this bug when sending message to myself, I don't know how to solve it because it seems to come from my email provider's server isn't ? It appeared almost a month ago.

It follow my ticket on deltaChat desktop : deltachat/deltachat-desktop#5877
I succeed to send myself email from Webapp and Thunderbird.

Is there a path to follow to fix localy either SMTP or DNS, reset my account, please ?

• Operating System (Linux Ubuntu & Android):
• Mailo & Lilo.org email provider
• Delta Chat Version: 2.25.3 (git: flathub) & 2.33.1 (android)
• Expected behavior: Send private saved messages
• Actual behavior: Fail - ERROR
• Steps to reproduce the problem: write and send a message to yourself
• Screenshots:
• Desktop

• Mobile

• Logs:

• Desktop

2025-12-14T12:28:46.308Z	core/event            	INFO	""	2	"src/imap/select_folder.rs:79: Selected folder \"INBOX\"."
2025-12-14T12:28:46.309Z	core/event            	WARNING	""	2	"src/imap/select_folder.rs:167: SELECT response for IMAP folder \"INBOX\" has no UIDNEXT, fall back to STATUS command."
2025-12-14T12:28:46.431Z	core/event            	INFO	""	2	"src/imap/idle.rs:39: Skipping IDLE in \"INBOX\" because there may be new mail."
2025-12-14T12:28:46.431Z	core/event            	INFO	""	2	"src/scheduler.rs:419: IMAP loop iteration for inbox finished, keeping the session."
2025-12-14T12:28:46.432Z	core/event            	INFO	""	2	"src/imap.rs:546: Not fetching from \"INBOX\"."
2025-12-14T12:28:46.432Z	core/event            	INFO	""	2	"src/imap.rs:1194: Server does not support CONDSTORE, skipping flag synchronization."
2025-12-14T12:28:46.432Z	core/event            	INFO	""	2	"src/scheduler.rs:679: IMAP session in folder \"INBOX\" supports IDLE, using it."
2025-12-14T12:28:46.473Z	core/event            	INFO	""	2	"src/imap/idle.rs:64: IDLE entering wait-on-remote state in folder \"INBOX\"."
2025-12-14T12:28:55.033Z	core/event            	INFO	""	2	"src/ephemeral.rs:610: Ephemeral loop waiting for deletion in 53h 1m 47s or interrupt"
2025-12-14T12:28:55.038Z	core/event            	INFO	""	2	"src/scheduler.rs:840: SMTP fake idle interrupted."
2025-12-14T12:28:55.038Z	core/event            	INFO	""	2	"src/smtp.rs:513: Selected rows from SMTP queue: [245]."
2025-12-14T12:28:55.045Z	core/event            	INFO	""	2	"src/smtp.rs:133: SMTP trying to connect to mail.lilo.org:465:tls."
2025-12-14T12:28:55.047Z	core/event            	INFO	""	2	"src/net/dns.rs:134: Using memory-cached DNS resolution for mail.lilo.org."
2025-12-14T12:28:55.048Z	core/event            	INFO	""	2	"src/net/dns.rs:180: Resolved mail.lilo.org into 213.182.54.20."
2025-12-14T12:28:55.048Z	core/event            	INFO	""	2	"src/smtp/connect.rs:108: Attempting SMTP connection to mail.lilo.org (213.182.54.20:465)."
2025-12-14T12:28:55.658Z	core/event            	INFO	""	2	"src/smtp.rs:389: Try number 1 to send message Msg#3708 (entry 245) over SMTP."
2025-12-14T12:28:58.781Z	core/event            	INFO	""	2	"src/smtp.rs:208: SMTP failed to send: Permanent(Response { code: Code { severity: PermanentNegativeCompletion, category: MailSystem, detail: Four }, message: [\"Message delivery error\"] })."
2025-12-14T12:28:58.781Z	core/event            	INFO	""	2	"src/smtp.rs:241: Permanent error, message sending failed."
2025-12-14T12:28:58.782Z	core/event            	INFO	""	2	"src/smtp.rs:284: Failed to send message over SMTP, disconnecting."
2025-12-14T12:28:58.782Z	core/event            	WARNING	""	2	"src/message.rs:1904: Msg#3708 failed: Permanent SMTP error: permanent: Message delivery error"
2025-12-14T12:28:58.782Z	core/event            	WARNING	""	2	"src/scheduler.rs:786: send_smtp_messages failed: Failed to send message: Permanent SMTP error: permanent: Message delivery error."
2025-12-14T12:28:58.783Z	core/event            	INFO	""	2	"src/scheduler.rs:808: SMTP fake idle started."
2025-12-14T12:28:58.786Z	core/event            	INFO	""	2	"src/scheduler.rs:820: SMTP has messages to retry, planning to retry 30 seconds later."
2025-12-14T12:29:01.256Z	main/menu             	INFO	""	"rebuilding menu with locale fr"
2025-12-14T12:29:01.261Z	core/event            	INFO	""	2	"src/imap/idle.rs:78: \"INBOX\": Received interrupt, stopping IDLE."
2025-12-14T12:29:01.263Z	core/event            	INFO	""	2	"src/imap/idle.rs:93: \"INBOX\": Idle wait was interrupted manually."
2025-12-14T12:29:01.263Z	core/event            	INFO	""	2	"src/imap/idle.rs:78: \"DeltaChat\": Received interrupt, stopping IDLE."
2025-12-14T12:29:01.264Z	core/event            	INFO	""	2	"src/imap/idle.rs:93: \"DeltaChat\": Idle wait was interrupted manually."
2025-12-14T12:29:01.264Z	core/event            	INFO	""	2	"src/scheduler.rs:840: SMTP fake idle interrupted."
2025-12-14T12:29:01.264Z	core/event            	INFO	""	2	"src/smtp.rs:513: Selected rows from SMTP queue: []."
2025-12-14T12:29:01.265Z	core/event            	INFO	""	2	"src/smtp.rs:615: Sending MDNs."
2025-12-14T12:29:01.265Z	core/event            	INFO	""	2	"src/scheduler.rs:808: SMTP fake idle started."
2025-12-14T12:29:01.266Z	core/event            	INFO	""	2	"src/scheduler.rs:836: SMTP has no messages to retry, waiting for interrupt."
2025-12-14T12:29:01.304Z	core/event            	INFO	""	2	"src/scheduler.rs:419: IMAP loop iteration for inbox finished, keeping the session."
2025-12-14T12:29:01.305Z	core/event            	INFO	""	2	"src/imap.rs:546: Not fetching from \"INBOX\"."
2025-12-14T12:29:01.306Z	core/event            	INFO	""	2	"src/imap.rs:1194: Server does not support CONDSTORE, skipping flag synchronization."
2025-12-14T12:29:01.307Z	core/event            	INFO	""	2	"src/scheduler.rs:679: IMAP session in folder \"INBOX\" supports IDLE, using it."
2025-12-14T12:29:01.307Z	core/event            	INFO	""	2	"src/scheduler.rs:742: IMAP loop iteration for Mvbox finished, keeping the session"
2025-12-14T12:29:01.307Z	core/event            	INFO	""	2	"src/imap.rs:588: fetch_new_msg_batch(DeltaChat): UIDVALIDITY=1742146877, UIDNEXT=16332."
2025-12-14T12:29:01.337Z	core/event            	INFO	""	2	"src/imap/idle.rs:64: IDLE entering wait-on-remote state in folder \"INBOX\"."
2025-12-14T12:29:01.395Z	core/event            	INFO	""	2	"src/imap.rs:774: 0 mails read from \"DeltaChat\"."
2025-12-14T12:29:01.395Z	core/event            	INFO	""	2	"src/imap.rs:1194: Server does not support CONDSTORE, skipping flag synchronization."
2025-12-14T12:29:01.396Z	core/event            	INFO	""	2	"src/scheduler.rs:679: IMAP session in folder \"DeltaChat\" supports IDLE, using it."
2025-12-14T12:29:01.437Z	core/event            	INFO	""	2	"src/imap/idle.rs:64: IDLE entering wait-on-remote state in folder \"DeltaChat\"."
2025-12-14T12:29:08.212Z	main/menu             	INFO	""	"rebuilding menu with locale fr"
2025-12-14T12:29:08.218Z	core/event            	INFO	""	2	"src/imap/idle.rs:78: \"INBOX\": Received interrupt, stopping IDLE."
2025-12-14T12:29:08.218Z	core/event            	INFO	""	2	"src/imap/idle.rs:78: \"DeltaChat\": Received interrupt, stopping IDLE."
2025-12-14T12:29:08.218Z	core/event            	INFO	""	2	"src/imap/idle.rs:93: \"INBOX\": Idle wait was interrupted manually."
2025-12-14T12:29:08.219Z	core/event            	INFO	""	2	"src/imap/idle.rs:93: \"DeltaChat\": Idle wait was interrupted manually."
2025-12-14T12:29:08.219Z	core/event            	INFO	""	2	"src/scheduler.rs:840: SMTP fake idle interrupted."
2025-12-14T12:29:08.219Z	core/event            	INFO	""	2	"src/smtp.rs:513: Selected rows from SMTP queue: []."
2025-12-14T12:29:08.220Z	core/event            	INFO	""	2	"src/smtp.rs:615: Sending MDNs."
2025-12-14T12:29:08.220Z	core/event            	INFO	""	2	"src/scheduler.rs:808: SMTP fake idle started."
2025-12-14T12:29:08.221Z	core/event            	INFO	""	2	"src/scheduler.rs:836: SMTP has no messages to retry, waiting for interrupt."
2025-12-14T12:29:08.255Z	core/event            	INFO	""	2	"src/scheduler.rs:742: IMAP loop iteration for Mvbox finished, keeping the session"
2025-12-14T12:29:08.255Z	core/event            	INFO	""	2	"src/imap.rs:588: fetch_new_msg_batch(DeltaChat): UIDVALIDITY=1742146877, UIDNEXT=16332."
2025-12-14T12:29:08.256Z	core/event            	INFO	""	2	"src/scheduler.rs:419: IMAP loop iteration for inbox finished, keeping the session."
2025-12-14T12:29:08.256Z	core/event            	INFO	""	2	"src/imap.rs:546: Not fetching from \"INBOX\"."
2025-12-14T12:29:08.257Z	core/event            	INFO	""	2	"src/imap.rs:1194: Server does not support CONDSTORE, skipping flag synchronization."
2025-12-14T12:29:08.258Z	core/event            	INFO	""	2	"src/scheduler.rs:679: IMAP session in folder \"INBOX\" supports IDLE, using it."
2025-12-14T12:29:08.291Z	core/event            	INFO	""	2	"src/imap/idle.rs:64: IDLE entering wait-on-remote state in folder \"INBOX\"."
2025-12-14T12:29:08.344Z	core/event            	INFO	""	2	"src/imap.rs:774: 0 mails read from \"DeltaChat\"."
2025-12-14T12:29:08.345Z	core/event            	INFO	""	2	"src/imap.rs:1194: Server does not support CONDSTORE, skipping flag synchronization."
2025-12-14T12:29:08.346Z	core/event            	INFO	""	2	"src/scheduler.rs:679: IMAP session in folder \"DeltaChat\" supports IDLE, using it."
2025-12-14T12:29:08.387Z	core/event            	INFO	""	2	"src/imap/idle.rs:64: IDLE entering wait-on-remote state in folder \"DeltaChat\"."

[iequidoo]

Have you tried to resend the message? It's "Resend" in the message context menu. I.e. does sending to yourself always fail? What if you send a message to another 1:1 chat? What if you create a group with only yourself and send a message there? Without having server logs it may be difficult to find the reason.

[link2xt]

Could be they don't like our To: hidden-recipients:; header since 2.29.0, but then I'd expect that they also don't allow sending any messages because we hide recipients not only for "saved messages", but for all messages.