I get a 550 Administrative prohibition message. /var/log/exim/mainlog tells me this: Code: 2006-08-29 18:27:27 SMTP connection from [XXX.96.167.231]:61403 I=[XXX.189.9.5]:25 (TCP/IP connection count = 1) 2006-08-29 18:27:32 1GI6Qk-000Keh-Tl failed to open DB file /var/spool/exim/db/wait-remote_smtp: Inappropriate file type or format 2006-08-29 18:27:32 1GI6Qk-000Keh-Tl ** emailA@address.ext F=<emailB@address.ext> P=<emailB@address.ext> R=lookuphost T=remote_smtp: SMTP error from remote mail server after RCPT TO:<emailA@address.ext>: host mx.address.ext [XXX.51.130.42]: 550 Administrative prohibition 2006-08-29 18:27:32 cwd=/var/spool/exim 7 args: /usr/local/sbin/exim -t -oem -oi -f <> -E1GI6Qk-000Keh-Tl 2006-08-29 18:27:32 1GI6R2-000Kg7-MW <= <> R=1GI6Qk-000Keh-Tl U=mailnull P=local S=108152 T="Mail delivery failed: returning message to sender" from <> for emailB@address.ext 2006-08-29 18:27:32 1GI6Qk-000Keh-Tl Completed QT=18s 2006-08-29 18:27:32 cwd=/var/spool/exim 3 args: /usr/local/sbin/exim -Mc 1GI6R2-000Kg7-MW 2006-08-29 18:27:32 cwd=/tmp 2 args: /usr/sbin/sendmail -bS 2006-08-29 18:27:32 SMTP connection from userB I'm not sure where my problem is. This doesn't soung too good: 1GI6Qk-000Keh-Tl failed to open DB file /var/spool/exim/db/wait-remote_smtp: Inappropriate file type or format. Can anybody give a me a clue? Tried the search, and specified on searching on this error, but couldn't find a good solution.