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Fetch IMAP message content using `BODY.PEEK[]` instead of `RFC822` to avoid provider-specific parser failures while preserving unread state. This also applies the existing SMTP timeout configuration to custom SMTP email-channel replies, so provider SMTP responses have enough time to complete. Fixes: https://github.com/chatwoot/chatwoot/issues/12762 ## Why Some IMAP providers can return responses for `FETCH RFC822` that Ruby `net-imap` fails to parse with: `Net::IMAP::ResponseParseError: unexpected RPAR (expected ATOM or NIL)` We reproduced this with iCloud IMAP. Authentication, `INBOX` selection, and header fetches worked, but fetching full message content with `RFC822` failed before Chatwoot received a `Mail::Message`. The same mailbox successfully returned full message content when fetched with `BODY.PEEK[]`. > During end-to-end iCloud validation, inbound fetch worked after the IMAP change, but outbound replies through the custom SMTP settings could still fail with a socket read timeout. The OAuth SMTP path already used explicit SMTP timeout values; the custom SMTP path was relying on mailer defaults instead. ## What this change does - Replaces the full message fetch from `RFC822` to `BODY.PEEK[]` - Reads the returned message content from `BODY[]`, which is how `net-imap` exposes the response attribute - Keeps the existing `BODY.PEEK[HEADER]` header-fetch behavior unchanged - Applies `SMTP_OPEN_TIMEOUT` and `SMTP_READ_TIMEOUT` to custom SMTP email-channel replies - Defaults custom SMTP reply delivery to `open_timeout: 15` and `read_timeout: 30` - Updates IMAP service specs for standard and Microsoft IMAP fetch flows - Updates mailer specs for custom SMTP timeout settings `BODY.PEEK[]` is preferable here because it fetches the full message content without marking messages as read. ## Validation - Configured a local email inbox against iCloud IMAP and SMTP - Confirmed `FETCH RFC822` reproduces `Net::IMAP::ResponseParseError: unexpected RPAR (expected ATOM or NIL)` - Confirmed `BODY[]` and `BODY.PEEK[]` fetch the same mailbox successfully - Confirmed Chatwoot imports iCloud messages after the IMAP change - Sent two outbound replies from the Chatwoot UI through iCloud SMTP after applying the timeout settings - Confirmed both UI-created outbound messages were marked `sent`, had iCloud SMTP `source_id` values, and had no `external_error` - Ran `bundle exec rspec spec/services/imap/fetch_email_service_spec.rb spec/services/imap/microsoft_fetch_email_service_spec.rb` - Ran `bundle exec rspec spec/mailers/conversation_reply_mailer_spec.rb` |
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|---|---|---|
| .. | ||
| authentication.rb | ||
| base_fetch_email_service.rb | ||
| fetch_email_service.rb | ||
| google_fetch_email_service.rb | ||
| microsoft_fetch_email_service.rb | ||