sq autocrypt encode-sender --address should check that there is a User ID with the stated address
This should fail, but it creates an autocrypt header with no User ID packet instead:
$ sq autocrypt encode-sender --address neal@foo.org < ~/neal.asc | sq autocrypt decode | sq inspect
-: OpenPGP Certificate.
Fingerprint: 8F17 7771 18A3 3DDA 9BA4 8E62 AACB 3243 6300 52D9
Invalid: No binding signature at time 2020-05-06T20:41:14Z
Public-key algo: RSA (Encrypt or Sign)
Public-key size: 3744 bits
Creation time: 2015-04-07 08:52:57 UTC