Hello - We are running LISTSERV on a Windows NT host (ddoc.adlt.com) and sending mail via a Lotus Domino SMTP MTA running on another Windows NT host (thorium.adlt.com). Many of our outbound messages fail, seemingly due to a DNS failure on the receiving end related to the address [log in to unmask] Two typical traces appear below. My questions are: 1) where does "[log in to unmask]" come from (it's not in the list header anywhere); and 2) any suggestions to fix this problem? Thanks in advance! Lowell S. Davis 09/26/2000 07:20:53 PM SMTPMTA: oseshlr0 <TRACE> DNS resolves CMC.NET to 1 address(es) 09/26/2000 07:20:53 PM SMTPMTA: oseshlr0 <TRACE> valid address/name [CMC.NET] 09/26/2000 07:20:53 PM SMTPMTA: oseshlr0 <TRACE> Attempting open to [206.102.31.250] 09/26/2000 07:20:53 PM SMTPMTA: oseshlr0 <TRACE> <- 220 bifur.cmc.net ESMTP Postfix 09/26/2000 07:20:53 PM SMTPMTA: oseshlr0 <TRACE> Input Command String -> HELO thorium.adlt.com 09/26/2000 07:20:53 PM SMTPMTA: oseshlr0 <TRACE> <- 250 bifur.cmc.net 09/26/2000 07:20:53 PM SMTPMTA: oseshlr0 <TRACE> Connected to hostname CMC.NET [206.102.31.250] 09/26/2000 07:20:53 PM SMTPMTA: oseshlr0 <TRACE> Host Name [CMC.NET] opened successfully 09/26/2000 07:20:53 PM SMTPMTA: oseshlr0 <TRACE> Input string Originator: [log in to unmask] 09/26/2000 07:20:53 PM SMTPMTA: oseshlr0 <TRACE> Input Command String -> MAIL FROM:<[log in to unmask]> 09/26/2000 07:20:53 PM SMTPMTA: oseshlr0 <TRACE> <- 250 Ok 09/26/2000 07:20:53 PM SMTPMTA: oseshlr0 <TRACE> Input string Recipient : [log in to unmask] 09/26/2000 07:20:53 PM SMTPMTA: oseshlr0 <TRACE> RCPT TO:<[log in to unmask]> 09/26/2000 07:20:53 PM SMTPMTA: oseshlr0 <TRACE> Input Command String -> RCPT TO:<[log in to unmask]> 09/26/2000 07:20:59 PM SMTPMTA: oseshlr0 <TRACE> <- 550 <[log in to unmask]>: Sender address rejected: Domain not found 09/26/2000 07:20:59 PM SMTPMTA: oseshlr0<TRACE> 'User Error: MTA 'CMC.NET' gives error message <[log in to unmask]>: Sender address rejected: Domain not found' line 332 file 'mta\pp_pi.lib\s\outbound.c' 09/26/2000 07:20:50 PM SMTPMTA: oseshlr1 <TRACE> DNS resolve host UP.NET 09/26/2000 07:20:50 PM SMTPMTA: oseshlr1 <TRACE> sending ns query (24 bytes) 09/26/2000 07:20:51 PM SMTPMTA: oseshlr1 <TRACE> 2 answers to query 09/26/2000 07:20:51 PM SMTPMTA: oseshlr1 <TRACE> using 2 mx hosts 09/26/2000 07:20:51 PM SMTPMTA: oseshlr1 <TRACE> 1 addresses saved for btc1.UP.NET 09/26/2000 07:20:51 PM SMTPMTA: oseshlr1 <TRACE> 1 addresses saved for btc2.UP.NET 09/26/2000 07:20:51 PM SMTPMTA: oseshlr1 <TRACE> DNS resolves UP.NET to 2 address(es) 09/26/2000 07:20:51 PM SMTPMTA: oseshlr1 <TRACE> Attempting open to [205.242.56.10] 09/26/2000 07:20:56 PM SMTPMTA: oseshlr1 <TRACE> <- 220 btc1.up.net ESMTP Sendmail 8.11.0/8.11.0; Tue, 26 Sep 2000 19:20:57 -0400 (EDT) 009/26/2000 07:20:56 PM SMTPMTA: oseshlr1 <TRACE> Input Command String -> HELO thorium.adlt.com 09/26/2000 07:20:56 PM SMTPMTA: oseshlr1 <TRACE> <- 250 btc1.up.net Hello [207.206.16.231], pleased to meet you 09/26/2000 07:20:56 PM SMTPMTA: oseshlr1 <TRACE> Connected to hostname UP.NET [205.242.56.10] 09/26/2000 07:20:56 PM SMTPMTA: oseshlr1 <TRACE> Host Name [UP.NET] opened successfully 09/26/2000 07:20:57 PM SMTPMTA: oseshlr1 <TRACE> Input string Originator: [log in to unmask] 09/26/2000 07:20:57 PM SMTPMTA: oseshlr1 <TRACE> Input Command String -> MAIL FROM:<[log in to unmask]> 09/26/2000 07:21:00 PM SMTPMTA: oseshlr1 <TRACE> <- 501 5.1.8 <[log in to unmask]>... Domain of sender address [log in to unmask] does not exist 09/26/2000 07:21:00 PM SMTPMTA: oseshlr1 <TRACE> Input Command String -> RSET 09/26/2000 07:21:00 PM SMTPMTA: oseshlr1 <TRACE> <- 250 2.0.0 Reset state 09/26/2000 07:21:00 PM SMTPMTA: oseshlr1<TRACE> 'Bad Parameter' line 230 file 'mta\pp_pi.lib\s\outbound.c' 009/26/2000 07:21:00 PM SMTPMTA: oseshlr1 <TRACE> The peer SMTP host reports that it received bad SMTP command syntax. 09/26/2000 07:21:00 PM SMTPMTA: oseshlr1 <TRACE> smtp_send_originator() temporary error, rcode=13233, Error Message: 2.0.0 Reset state, Mark the message list for a retry 09/26/2000 07:21:00 PM SMTPMTA: oseshlr1 <TRACE> OSHSendMail() reports a MSG_FATAL error. 09/26/2000 07:21:00 PM SMTPMTA: oseshlr1 <TRACE> Input Command String -> RSET 09/26/2000 07:21:00 PM SMTPMTA: oseshlr1 <TRACE> <- 250 2.0.0 Reset state 09/26/2000 07:21:00 PM SMTPMTA: oseshlr1 <TRACE> Input Command String -> QUIT 09/26/2000 07:21:01 PM SMTPMTA: oseshlr1 <TRACE> <- 221 2.0.0 btc1.up.net closing connection 09/26/2000 07:21:01 PM SMTPMTA: oseshlr1 <TRACE> Closing connection to [UP.NET]