I have four Exchange 2013 multi-role servers. A month or so ago I installed CU13 on all four. Prior to that, I was seeing sometimes large number of messages in Shadow Queues. After the update, two of my servers never show the presence of these queues while the other two seem to have between 40 and 60 messages in these types of queues. I run Paul Cunningham's Test-ExchangeServerHealth.ps1 script and it is not unusual for this to report an unhealthy or failed state for Transport Queue on these two servers.
Below is output from a get-queue from each server. I've replaced identifiable names with asterisks. Can anyone explain why the output is so different and what I might do to reduce this problem?
[PS] C:\Scripts>get-queue -server x1301 Identity DeliveryType Status MessageCount Velocity RiskLevel OutboundIPPool NextHopDomain -------- ------------ ------ ------------ -------- --------- -------------- ------------- x1301\3 SmtpRelay... Ready 0 0 Normal 0 **********.org_exsbr x1301\4 SmtpRelay... Ready 0 0 Normal 0 barracuda message arch... x1301\Submission Undefined Ready 0 0 Normal 0 Submission [PS] C:\Scripts>get-queue -server x1302 Identity DeliveryType Status MessageCount Velocity RiskLevel OutboundIPPool NextHopDomain -------- ------------ ------ ------------ -------- --------- -------------- ------------- x1302\Submission Undefined Ready 0 0 Normal 0 Submission [PS] C:\Scripts>get-queue -server x1303 Identity DeliveryType Status MessageCount Velocity RiskLevel OutboundIPPool NextHopDomain -------- ------------ ------ ------------ -------- --------- -------------- ------------- x1303\4 SmartHost... Ready 0 0 Normal 0 [10.241.0.77] x1303\5 SmtpDeliv... Ready 0 0 Normal 0 db25 x1303\6 SmtpDeliv... Ready 0 0 Normal 0 db13 x1303\7 SmtpDeliv... Ready 0 0 Normal 0 db15 x1303\8 SmtpDeliv... Ready 0 0 Normal 0 db05 x1303\9 SmtpDeliv... Ready 0 0 Normal 0 db01 x1303\10 SmtpDeliv... Ready 0 0 Normal 0 db22 x1303\11 SmartHost... Ready 0 0 Normal 0 mailmarshal.******.org x1303\12 SmtpDeliv... Ready 0 0 Normal 0 db18 x1303\13 SmtpDeliv... Ready 0 0 Normal 0 db10 x1303\14 SmtpDeliv... Ready 0 0 Normal 0 db23 x1303\15 SmtpDeliv... Ready 0 0 Normal 0 db08 x1303\16 SmtpDeliv... Ready 0 0 Normal 0 db27 x1303\17 SmtpDeliv... Ready 0 0 Normal 0 db03 x1303\18 SmtpDeliv... Ready 0 0 Normal 0 db06 x1303\19 SmtpDeliv... Ready 0 0 Normal 0 db20 x1303\20 SmtpDeliv... Ready 0 0 Normal 0 db19 x1303\21 SmartHost... Ready 0 0 Normal 0 mm-*****.******.org x1303\22 SmtpDeliv... Ready 0 0 Normal 0 db02 x1303\23 SmtpDeliv... Ready 0 0 Normal 0 db12 x1303\24 SmtpDeliv... Ready 0 0 Normal 0 db30 x1303\25 SmtpDeliv... Ready 0 0 Normal 0 db11 x1303\26 SmtpDeliv... Ready 0 0 Normal 0 db14 x1303\27 SmtpDeliv... Ready 0 0 Normal 0 db09 x1303\28 SmtpDeliv... Ready 0 0 Normal 0 db16 x1303\29 SmtpDeliv... Ready 0 0 Normal 0 db17 x1303\30 SmtpDeliv... Ready 0 0 Normal 0 db28 x1303\32 SmtpDeliv... Ready 0 0 Normal 0 db04 x1303\33 SmtpDeliv... Ready 0 0 Normal 0 db26 x1303\35 SmtpDeliv... Ready 0 0 Normal 0 db07 x1303\36 SmtpDeliv... Ready 0 0 Normal 0 db29 x1303\39 SmtpDeliv... Ready 0 0 Normal 0 db21 x1303\40 SmtpDeliv... Ready 0 0 Normal 0 db24 x1303\42 SmartHost... Ready 0 0 Normal 0 mm-******.******.org x1303\43 SmartHost... Ready 0 0 Normal 0 mm-*******.******.org x1303\45 SmartHost... Ready 0 0 Normal 0 mm-*****.******.org x1303\46 SmartHost... Ready 0 0 Normal 0 mm-**.******.org x1303\Submission Undefined Ready 0 0 Normal 0 Submission x1303\Shadow\3 ShadowRed... Ready 10 0 Normal 0 x1304.******.priv x1303\Shadow\419 ShadowRed... Ready 1 0 Normal 0 x1301.******.priv [PS] C:\Scripts>get-queue -server x1304 Identity DeliveryType Status MessageCount Velocity RiskLevel OutboundIPPool NextHopDomain -------- ------------ ------ ------------ -------- --------- -------------- ------------- x1304\40 SmtpDeliv... Ready 0 0 Normal 0 db05 x1304\41 SmartHost... Ready 1 0 Normal 0 [10.241.0.77] x1304\42 SmtpDeliv... Ready 0 0 Normal 0 db15 x1304\43 SmtpDeliv... Ready 0 0 Normal 0 db28 x1304\44 SmtpDeliv... Ready 0 0 Normal 0 db01 x1304\45 SmtpDeliv... Ready 0 0 Normal 0 db20 x1304\46 SmtpDeliv... Ready 0 0 Normal 0 db16 x1304\47 SmtpDeliv... Ready 0 0 Normal 0 db17 x1304\48 SmtpDeliv... Ready 0 0 Normal 0 db23 x1304\49 SmtpDeliv... Ready 0 0 Normal 0 db22 x1304\50 SmtpDeliv... Ready 0 0 Normal 0 db07 x1304\51 SmtpDeliv... Ready 0 0 Normal 0 db30 x1304\52 SmtpDeliv... Ready 0 0 Normal 0 db14 x1304\53 SmtpDeliv... Ready 0 0 Normal 0 db10 x1304\54 SmtpDeliv... Ready 0 0 Normal 0 db08 x1304\55 SmtpDeliv... Ready 0 0 Normal 0 db19 x1304\56 SmtpDeliv... Ready 0 0 Normal 0 db25 x1304\57 SmtpDeliv... Ready 0 0 Normal 0 db06 x1304\60 SmtpDeliv... Ready 0 0 Normal 0 db21 x1304\61 SmtpDeliv... Ready 0 0 Normal 0 db09 x1304\63 SmtpDeliv... Ready 0 0 Normal 0 db13 x1304\64 SmtpDeliv... Ready 0 0 Normal 0 db24 x1304\65 SmtpDeliv... Ready 0 0 Normal 0 db18 x1304\66 SmtpDeliv... Ready 0 0 Normal 0 db03 x1304\67 SmtpDeliv... Ready 0 0 Normal 0 db27 x1304\68 SmtpDeliv... Ready 0 0 Normal 0 db29 x1304\69 SmtpDeliv... Ready 0 0 Normal 0 db12 x1304\71 SmtpDeliv... Ready 0 0 Normal 0 db11 x1304\72 SmtpDeliv... Ready 0 0 Normal 0 db26 x1304\73 SmtpDeliv... Ready 0 0 Normal 0 db04 x1304\82 SmtpDeliv... Ready 0 0 Normal 0 db02 x1304\226 SmartHost... Ready 0 0 Normal 0 mm-**.******.org x1304\235 SmartHost... Ready 0 0 Normal 0 mm-*****.******.org x1304\240 SmartHost... Ready 0 0 Normal 0 mailmarshal.******.org x1304\243 SmartHost... Ready 0 0 Normal 0 mm-********.******.org x1304\264 SmartHost... Ready 0 0 Normal 0 mm-*****.******.org x1304\289 SmartHost... Ready 0 0 Normal 0 mm-******.******.org x1304\Submission Undefined Ready 6 0 Normal 0 Submission x1304\Shadow\39 ShadowRed... Ready 37 0 Normal 0 x1303.******.priv x1304\Shadow\200 ShadowRed... Ready 0 0 Normal 0 x1301.******.priv [PS] C:\Scripts>