Exchange 2013 – Send & Receive Connector Issue.

We have four server roles in our environment i.e. PS-MB1, PS-MB2, PS-CAS1 and PS-CAS2.

As per company policy our limits are:

Sending Inside organization : 3MB Max.

Receiving Inside organization : Unlimitedß for receiving emails from Inside andInternet.

Sending Outside organization : 3MB Max.

Receiving from Internet : 35MB Max. ßIts bounce back emails on Internet larger than 3MB

Commands outputs are mentioned below for your reference:

[PS] C:\Windows\system32>Get-ReceiveConnector

Identity                               Bindings                               Enabled

--------                               --------                               -------

PS-MB1\Default PS-MB1                  {[::]:25, 0.0.0.0:25}                  True

PS-MB1\Client Proxy PS-MB1             {[::]:465, 0.0.0.0:465}                True

PS-MB2\Default PS-MB2                  {[::]:25, 0.0.0.0:25}                   True

PS-MB2\Client Proxy PS-MB2             {[::]:465, 0.0.0.0:465}                True

PS-CAS1\Default Frontend PS-CAS1       {[::]:25, 0.0.0.0:25}                  True

PS-CAS1\Outbound Proxy Frontend PS-CAS1 {[::]:717, 0.0.0.0:717}                True

PS-CAS1\Client Frontend PS-CAS1        {[::]:587, 0.0.0.0:587}                True

PS-CAS2\Default Frontend PS-CAS2       {[::]:25, 0.0.0.0:25}                  True

PS-CAS2\Outbound Proxy Frontend PS-CAS2 {[::]:717, 0.0.0.0:717}                True

PS-CAS2\Client Frontend PS-CAS2        {[::]:587, 0.0.0.0:587}                True

PS-MB1\Client Application Relay PS-MB1  {0.0.0.0:25}                           True

PS-MB1\Exchenge.test                   {0.0.0.0:25}                           False

PS-MB2\Client Application Relay PS-MB2  {0.0.0.0:25}                           True

[PS] C:\Windows\system32>get-receiveconnector | ft name, maxmessagesize

Name                                                       MaxMessageSize

----                                                        --------------

Default PS-MB1                                             35 MB (36,700,160 bytes)

Client Proxy PS-MB1                                        35 MB (36,700,160 bytes)

Default PS-MB2                                              35 MB (36,700,160 bytes)

Client Proxy PS-MB2                                        35 MB (36,700,160 bytes)

Default Frontend PS-CAS1                                   36 MB (37,748,736 bytes)

Outbound Proxy Frontend PS-CAS1                            36 MB (37,748,736 bytes)

Client Frontend PS-CAS1                                    35 MB (36,700,160 bytes)

Default Frontend PS-CAS2                                   36 MB (37,748,736 bytes)

Outbound Proxy Frontend PS-CAS2                            36 MB (37,748,736 bytes)

Client Frontend PS-CAS2                                    35 MB (36,700,160 bytes)

Client Application Relay PS-MB1                            35 MB (36,700,160 bytes)

Exchenge.test                                              35 MB (36,700,160 bytes)

[PS] C:\Windows\system32>get-transportconfig | ft maxsendsize, maxreceivesize

MaxSendSize                                                MaxReceiveSize

-----------                                                 --------------

3 MB (3,145,728 bytes)                                     Unlimited

[PS] C:\Windows\system32>get-sendconnector | ft name, maxmessagesize

Name                                                       MaxMessageSize

----                                                       --------------

Internet                                                   35 MB (36,700,160 bytes)

Question: Why ae are facing trouble in receiving 3MB+ size email from internet.