The two links below will open new tabs or windows at a multi-list checking site or Senderbase (cisco/Ironport).
Multi-list block list check (mxtoolbox)
Cisco "Ironport" check (Senderbase)
Below are the results of checking for pending mail for the major sites listed and for logfile entries that suggest deferrals based on reputation. A small backlog is not uncommon.
These counts are updated every 15 minutes.
Current major sites list: aol.com,live.com,outlook.com,yahoo.com,gmail.com,google.com.
Current major site backlog: 67
Reputation count: 70
as of Thu 22-Feb-2018 15:35 EST