The Ex-command :%s/^mailRoutingAddress:.*// seems to work but is leaving a line...like this :
dn: uid=apache,ou=People,dc=im,dc=logica,dc=com
uid: apache
cn: Apache
sn: Apache
mail:
apache@logica.com
mailRoutingAddress:
apache@mail.logica.com
mailHost: mail.logica.com
objectClass: inetLocalMailRecipient
objectClass: person
objectClass: organizationalPerson
objectClass: inetOrgPerson
objectClass: posixAccount
objectClass: top
objectClass: kerberosSecurityObject
objectClass: shadowAccount
userPassword: {crypt}!!
shadowLastChange: 13801
shadowMax: 99999
shadowWarning: 7
loginShell: /sbin/nologin
uidNumber: 48
gidNumber: 48
homeDirectory: /var/www
gecos: Apache
How to delete the blank line