UwUMail Server 0.20.0

Mail from Outlook and Exchange (docs/winmail-dat.md):

• winmail.dat (TNEF) is decoded. Attachments, including long Unicode names and attached messages,
  show up as normal JMAP attachments; the body (compressed RTF, including HTML wrapped in it) is
  shown when the mail has no better one. Meeting requests, answers and cancellations inside
  winmail.dat reach the calendar like iMIP invitations and appear as an invite.ics attachment.
  Search, previews, hasAttachment, the spam check and the AI assistant see what is inside (search,
  preview and hasAttachment for mail delivered from now on). Stored mail stays byte for byte as it
  came (DKIM keeps verifying), IMAP is unchanged; decoding happens when the mail is read. The
  decoder is its own crate, uwumail-tnef, shared with the UwUMail client.
• Microsoft Safe Links are unwrapped in previews, the search index and the links the assistant
  gets; the webmail shows and opens the real address.

Delivering to Microsoft (docs/microsoft.md):

• Refusals and throttling by Outlook.com, Hotmail and Microsoft 365 (S3150/S3140, banned
  senders, 5.7.606–5.7.7xx such as 5.7.708, 4.7.650/4.7.500, 5.7.515, 5.7.509) are
  recognised during delivery and kept as issues per sending address or domain, with first and last
  seen and a count. They show in the server overview and a banner with the code, the address, what
  it means and a link to Microsoft's delisting form; admins get an alert mail, at most once a day
  while a block lasts. Issues close by themselves a day after mail to Microsoft goes through again,
  or by hand. Migration 0061_microsoft_issues.sql.
• The sender's bounce explains in plain words that Microsoft is blocking or throttling the server and
  that the admins know. Changed: bounces to your own users now come in the user's language
  instead of the server's.
• New Server → Microsoft page: a checklist of Microsoft's 2025 sender rules (SPF, DKIM, DMARC and
  alignment, reverse DNS, TLS, one-click unsubscribe) and step-by-step guides for SNDS, JMRP and
  delisting.

BIMI per domain (docs/bimi.md): upload the logo as SVG, the server cleans it
into SVG Tiny PS and hosts it (with an optional VMC/CMC) at https://<host>/bimi/<domain>.svg,
suggests the default._bimi record, checks it with the DNS check, puts it in through the
Cloudflare button and says whether DMARC is strict enough. BIMI logos show in Gmail, Apple Mail,
Yahoo and others, not in Outlook; Gmail and Apple need a mark certificate. Migration 0062_bimi.sql.

AI costs count everything a request can cost (docs/jmap-assist.md, docs/llm.md):

• Price lists are read in full from LiteLLM and OpenRouter: thinking (reasoning) tokens, cached
  prompt tokens, fees per request, pictures, web searches and higher prices for large prompts. A
  price per request can also be set by hand (pricePerRequest).
• Assist/estimate lists each model call (calls, including the retry without answer schema,
  weighted by how often it happens), adds the API's framing, the typical thinking of reasoning
  models (reasoningTokens), the text read from pictures (imageCount, imageTokens), a worst
  case (cost.max) and the split of the cost (cost.parts). It learns from the last 50 real
  requests per provider, model and feature (calibrated).
• The real cost uses what the provider reported: cached tokens, thinking, request fees, OpenRouter's
  own usage.cost. Usage keeps reasoningTokens, cachedTokens and calls; thinking tokens count
  toward the daily token limit. The portal shows the whole price sheet and a thinking column in the
  statistics. Migrations 0063_assist_cost_details.sql, 0064_assist_calibration.sql.

Webmail 0.20.0 (bundled): Safe Links show and open their real address, Teams meeting links get
a join bar, and the AI estimate tooltip shows the worst case ("≈ 1.250 Tokens · ≈ 0,02 € (max.
0,05 €)"), a short breakdown and whether it is calibrated.