[landsman]

The first Slovak bank, on #46's IBANs. ČSOB SK's "ČSOB Info 24 - Avízo", from tomaj/bank-mails-parser's fixtures and remp2020's raw e-mail (both MIT, 2019); samples only, so no key is pinned.

It may never verify as it stands: remp2020's e-mail carries no DKIM signature of the bank, only Gmail's ARC, and csob.sk is not DNSSEC-signed. Even with a key pinned, withDns() would refuse it. A real e-mail has to show whether ČSOB SK signs, and under which domain; the page and the class say so.

• IBANs for both accounts (BankAccount.parseIban), windows-1250 in base64 like the real e-mail; the fixture is synthetic, with a valid fake counter-party IBAN (the sample's is anonymised and fails its check digits).
• Only incoming: an amount with a minus is refused, none having been seen.
• The symbols come from the payer's reference (/VS…/SS…/KS…), text the payer wrote; NOTPROVIDED is none. The template prints that line every time, so it is required exactly once and must follow the counter-party's name directly.
• Past the message for the recipient no labelled line may follow, and a second booking sentence is refused: tests reproduce tomaj's utok-fantom-sprava and utok-ucet-v-sprave.

Each of four guards was broken in turn and a test failed for each. make build: green.