[otrs] help with MX record checking on OTRS 1.3.2

Hi there, I'm having problems with "Phone ticket" under OTRS 1.3.2. When I put in the customer name and ID with an email address outside of "sun.com", it responds with "invalid MX". I've set [...] # CheckEmailAddresses # (Check syntax of used email addresses) $Self->{CheckEmailAddresses} = 0; [...] Example 13-6. Kernel/Config.pm - CheckMXRecord [...] # CheckMXRecord # (Check mx recorde of used email addresses) $Self->{CheckMXRecord} = 0; [...] but this makes no difference. Any ideas ?