X400: Domain Defined Attribute Value to Reach SMTP

SUMMARY

The domain-defined attribute value (DDA value) should be used when a mail system requires address mapping to some component of the X.400 originator/recipient (O/R) name. In SMTP mail systems, the DDA value usually contains the SMTP address of the recipient. Since the @ character is illegal for X.400 O/R name values, you should enter the SMTP address this way: where the (a) character takes the place of the @ character.