Error SMTP 550 SC-001, the IP address of the e-mail server on MS blocklist

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• No e-mail entering the e-mail server

  Dear friend,

  I made a new configuration on ASA5505. This ASA to connect a switch that spread from the user and the mail server.  User from the local network able to browse the Internet and send emails to user/e-mail external. The problem is no email don't come through the outside entrance to the mail server.
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  !
  interface Vlan1
  nameif inside
  security-level 100
  IP 192.168.100.1 address 255.255.255.0
  !
  interface Vlan2
  nameif outside
  security-level 0
  IP address s.s.160.26 255.255.255.252
  !
  interface Ethernet0/0
  switchport access vlan 2
  !
  2KFQnbNIdI.2KYOU encrypted passwd
  passive FTP mode
  DNS server-group DefaultDNS
  domain default.domain.invalid
  inside_access_in of access allowed any ip an extended list
  outside_access_in of access allowed any ip an extended list
  outside_access_in list extended access permit tcp any any eq
  POP3
  outside_access_in list extended access permit tcp any any eq
  SMTP
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  pager lines 24
  asdm of logging of information
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  Outside 1500 MTU
  mask IP local pool 192.168.100.240 pool - 192.168.100.242
  255.255.255.0

  ICMP unreachable rate-limit 1 burst-size 1
  ASDM image disk0: / asdm - 523.bin
  don't allow no asdm history
  ARP timeout 14400

  Global 1 interface (outside)
  NAT (inside) 0-list of access inside_nat0_outbound
  NAT (inside) 1 0.0.0.0 0.0.0.0 dns
  public static s.s.160.26 (Interior, exterior) 192.168.100.250
  subnet mask 255.255.255.255

  inside_access_in access to the interface inside group
  Access-group outside_access_in in interface outside
  Route inside 0.0.0.0 0.0.0.0 192.168.100.250 2
  Route outside 0.0.0.0 0.0.0.0 s.s.160.25 1

  Hi Mohd,

  Something seems wrong with the NAT configuration.

  You forgot to hide the IP address on VLAN 2, that is your ip of the interface. (I'd edit the post and making it s.s.160.26).

  So, if your external interface ip,'s s.s.160.26, while NAT static (inside, outside) s.s.160.26 192.168.100.250 may not exist!

  You need to have something like:

  public static tcp (indoor, outdoor) interface smtp 192.168.100.250 smtp

  public static tcp (indoor, outdoor) interface 192.168.100.250 imap imap

  public static tcp (indoor, outdoor) interface 192.168.100.250 pop3 pop3

  In addition, another suggestion I would give:

  Have the input access list outside_access_in extended ip allowed any one isn't safe. However, if you only use it to troubleshoot e-mail server problems, then it is fine. Remove in case of actual production.

  I hope this helps.

  -Shrikant

  PS: Please mark this question as answered if it was resolved. Note the useful messages. Thank you.