OpenSSL error: data too large for key size

[Ralf Hildebrandt]

In my log I'm getting:

Sep 30 13:43:18 mail amavis[11001]: (11001-11) dkim: FAILED Author+Sender+MailFrom signature by d=galahotels.com, From:
<promotions at galahotels.com>, a=rsa-sha1, c=simple, s=mail, i=promotions at galahotels.com,
m.list(ml:http://www.helenemail.com/Unsubscribe.aspx?Email=torsten.xxxxxxier@charite.de&id=5066>,<mailto:unsubscribe at helenemail.com?subject=5066_1),
fail (OpenSSL error: data too large for key size)

and

Sep 30 14:02:00 mail amavis[17575]: (17575-10) dkim: FAILED Author+Sender+MailFrom signature by d=jobmensa.de, From:
<Jobvorschlag at jobmensa.de>, a=rsa-sha256, c=relaxed/relaxed, s=mail, i=@jobmensa.de, invalid (public key: OpenSSL error: too long)

What are those errors?
-- 
Ralf Hildebrandt
  Geschäftsbereich IT | Abteilung Netzwerk
  Charité - Universitätsmedizin Berlin
  Campus Benjamin Franklin
  Hindenburgdamm 30 | D-12203 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  ralf.hildebrandt at charite.de | http://www.charite.de