I was setting up a local mailserver to get all messages from <a href="http://mail.amellar.com">mail.amellar.com</a> using RHEL 4 AS, sendmail-8.13.1-2, dovecot-0.99.11-2.EL4.1, fetchmail-5.9.0-1. Im using outlook express as mail client I have no problem popping all the messages from the remote mail server but when I used outlook express to send email to yahoo or gmail all the emails went to bulk or spam while the others cannot be send. I had read the knowledgebase and googled but still unsuccessful here are my configuration. Dovecot.conf protocols = pop3 imap_listen = [::] pop3_listen = [::] login_dir = /var/run/dovecot-login login = imap login = pop3 mbox_locks = fcntl auth = default auth_mechanisms = plain auth_userdb = passwd auth_passdb = pam auth_user = root <a href="http://sendmail.mc">sendmail.mc</a> include(`/usr/share/sendmail-cf/m4/cf.m4')dnl VERSIONID(`setup for Red Hat Linux')dnl OSTYPE(`linux')dnl define(`confDEF_USER_ID',``8:12'')dnl define(`confTO_CONNECT', `1m')dnl define(`confTRY_NULL_MX_LIST',true)dnl define(`confDONT_PROBE_INTERFACES',true)dnl define(`PROCMAIL_MAILER_PATH',`/usr/bin/procmail')dnl define(`ALIAS_FILE', `/etc/aliases')dnl define(`STATUS_FILE', `/var/log/mail/statistics')dnl define(`UUCP_MAILER_MAX', `2000000')dnl define(`confUSERDB_SPEC', `/etc/mail/userdb.db')dnl define(`confPRIVACY_FLAGS', `authwarnings,novrfy,noexpn,restrictqrun')dnl define(`confAUTH_OPTIONS', `A')dnl dnl define(`confCACERT_PATH',`/usr/share/ssl/certs') dnl define(`confCACERT',`/usr/share/ssl/certs/ca-bundle.crt') dnl define(`confSERVER_CERT',`/usr/share/ssl/certs/sendmail.pem') dnl define(`confSERVER_KEY',`/usr/share/ssl/certs/sendmail.pem') dnl define(`confDONT_BLAME_SENDMAIL',`groupreadablekeyfile')dnl define(`confTO_IDENT', `0')dnl FEATURE(`no_default_msa',`dnl')dnl FEATURE(`smrsh',`/usr/sbin/smrsh')dnl FEATURE(`mailertable',`hash -o /etc/mail/mailertable.db')dnl FEATURE(`virtusertable',`hash -o /etc/mail/virtusertable.db')dnl FEATURE(redirect)dnl FEATURE(always_add_domain)dnl FEATURE(use_cw_file)dnl FEATURE(use_ct_file)dnl FEATURE(local_procmail,`',`procmail -t -Y -a $h -d $u')dnl FEATURE(`access_db',`hash -T<TMPF> -o /etc/mail/access.db')dnl FEATURE(`blacklist_recipients')dnl EXPOSED_USER(`root')dnl DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl FEATURE(`accept_unresolvable_domains')dnl LOCAL_DOMAIN(`localhost.localdomain')dnl define(`SMART_HOST',`host.amellar.com')dnl define(`confDIRECT_SUBMISSION_MODIFIERS',`C') FEATURE(always_add_domain)dnl FEATURE(`masquerade_entire_domain') FEATURE(`masquerade_envelope') FEATURE(`allmasquerade') MAILER(smtp)dnl MAILER(procmail)dnl MASQUERADE_AS(`amellar.com.') MASQUERADE_DOMAIN(`amellar.com.') MASQUERADE_AS( <a href="http://amellar.com">amellar.com</a>) Here is /var/log/maillog Sep 26 22:00:49 host sendmail[3387]: k8QDxmaH003385: to=<<a href="mailto:jpco_122122@yahoo.com">jpco_122122@yahoo.com</a>>, ctladdr=< <a href="mailto:jporpilla@amellar.com">jporpilla@amellar.com</a>> (501/501), delay=00:01:01, xdelay=00:01:01, mailer=esmtp, pri=121172, relay=<a href="http://yahoo.com">yahoo.com</a> [<a href="http://216.109.112.135">216.109.112.135 </a>], dsn=4.0.0, stat=Deferred: Connection reset by <a href="http://yahoo.com">yahoo.com</a>