[Exim] crypteq: Encryption type

Hi,

I am using crypteq to compare a password against an MD5 hash in my database
for AUTH SMTP. I am using the following command (without the DB lookup):
server_condition = "\
    ${if crypteq{$3}{\{md\}1a1dc91c907325c69271ddf0c944bc72} {1} {0} }"

On each AUTH SMTP request, exim logs:
Unable to authenticate at present: unknown encryption mechanism in "{md5"

It seems that exim cuts away everything after \}, although it is quoted.

Am I doing something wrong here or is this a bug in exim (v3.15)?

Jens