My notes, things I have learned, and documentation I have created.

There are a number ways to control message size in Exchange. Many actually. Even down to the header size.

Reference: https://technet.microsoft.com/en-us/library/bb124345(v=exchg.141).aspx

Here are the options I have been most likely to use:
This is where you set your server parameters. This setting applies to all users on the server:
To view your current settings:

Get-TransportConfig | Select MaxSendSize,MaxReceiveSize

To modify your settings:

Set-TransportConfig -MaxSendSize 15MB -MaxReceiveSize 15MB

Here is where you can set the parameter based on a receive connector only:

Get-RecieveConnector | Select MaxMessageSize

To modify:

Set-ReceiveConnector -Identity “receiveconnectorname” -MaxMessageSize 15MB

And this for a send connector:

Get-SendConnector | Select MaxMessageSize

To modify:

Set-SendConnector -Identity “sendconnectorname” -MaxMessageSize 15MB

This is where you would set it for the individual mailbox. So, you might want have your other settings high, and restrict by mailbox if the need is there.
To view a mailbox’s limits:

Get-Mailbox | Select Name,MaxSendSize,MaxReceiveSize
Get-Mailbox mailboxname | Select Name,MaxSendSize,MaxReceiveSize

To modify:

Set-Mailbox jgz -MaxSendSize 100MB -MaxReceiveSize 100MB

To put a iPhone 8 or 8 Plus into recovery mode is a little different than in past models.

Have your phone plugged into iTunes and turned off.

The following steps should be be done quickly:

1) Press and release the Volume Up button.

2) Press and release the Volume Down button.

3) Press and hold the Power button on the side of the phone. Keep holding it until to iTunes tell you the phone is in recovery mode.

I had to deal with a really neglected domain, and found that all the FSMO roles were on a domain controller that no longer functioned or existed. I had to get the roles on the working server. Using convental methods in the UI or the ntdsutil to transfer the roles succeeded. I had no choice, but to seize all the roles from the missing server. All of these tasks were completed on the domain controller I wanted the roles on as the domain\Administrator.

Check the current roles holders:

C:\>netdom query fsmo
Schema master MYOLDDC1.mydomain.local
Domain naming master MYOLDDC1.mydomain.local
PDC MYOLDDC1.mydomain.local
RID pool manager MYOLDDC1.mydomain.local
Infrastructure master MYOLDDC1.mydomain.local
The command completed successfully.

Enter the ntdsutil utility by entering ntdsutil:

C:\>ntdsutil

And then roles:

ntdsutil: roles

You see the options by entering a question mark at the “fsmo maintenance” prompt. Obviously, this where you also transfer the roles if possible (not so in my case):

fsmo maintenance: ?

? – Show this help information
Connections – Connect to a specific AD DC/LDS instance
Help – Show this help information
Quit – Return to the prior menu
Seize infrastructure master – Overwrite infrastructure role on connected server
Seize naming master – Overwrite Naming Master role on connected server
Seize PDC – Overwrite PDC role on connected server
Seize RID master – Overwrite RID role on connected server
Seize schema master – Overwrite schema role on connected server
Select operation target – Select sites, servers, domains, roles and
naming contexts
Transfer infrastructure master – Make connected server the infrastructure master
Transfer naming master – Make connected server the naming master
Transfer PDC – Make connected server the PDC
Transfer RID master – Make connected server the RID master
Transfer schema master – Make connected server the schema master

Seize the roles one at a time. Each takes a while to complete, but they do.:

fsmo maintenance: seize pdc
Attempting safe transfer of PDC FSMO before seizure.
ldap_modify_sW error 0x34(52 (Unavailable).
Ldap extended error message is 000020AF: SvcErr: DSID-03210617, problem 5002 (UNAVAILABLE), data 1722

Win32 error returned is 0x20af(The requested FSMO operation failed. The current FSMO holder could not be contacted.)
)
Depending on the error code this may indicate a connection,
ldap, or role transfer error.
Transfer of PDC FSMO failed, proceeding with seizure …
Server “mydc01” knows about 5 roles
Schema – CN=NTDS Settings,CN=MYOLDDC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
Naming Master – CN=NTDS Settings,CN=MYOLDDC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
PDC – CN=NTDS Settings,CN=MYDC01,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
RID – CN=NTDS Settings,CN=MYOLDDC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
Infrastructure – CN=NTDS Settings,CN=MYOLDDC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
fsmo maintenance:
fsmo maintenance: seize naming master
Attempting safe transfer of domain naming FSMO before seizure.
ldap_modify_sW error 0x34(52 (Unavailable).
Ldap extended error message is 000020AF: SvcErr: DSID-0321041F, problem 5002 (UNAVAILABLE), data 1722

Win32 error returned is 0x20af(The requested FSMO operation failed. The current FSMO holder could not be contacted.)
)
Depending on the error code this may indicate a connection,ldap, or role transfer error.
Transfer of domain naming FSMO failed, proceeding with seizure …
Server “mydc01” knows about 5 roles
Schema – CN=NTDS Settings,CN=MYOLDDC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
Naming Master – CN=NTDS Settings,CN=MYDC01,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
PDC – CN=NTDS Settings,CN=MYDC01,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
RID – CN=NTDS Settings,CN=MYOLDDC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
Infrastructure – CN=NTDS Settings,CN=MYOLDDC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
fsmo maintenance: seize rid master
Attempting safe transfer of RID FSMO before seizure.
ldap_modify_sW error 0x34(52 (Unavailable).
Ldap extended error message is 000020AF: SvcErr: DSID-03210F70, problem 5002 (UNAVAILABLE), data 1722

Win32 error returned is 0x20af(The requested FSMO operation failed. The current FSMO holder could not be contacted.)
)
Depending on the error code this may indicate a connection, ldap, or role transfer error.
Transfer of RID FSMO failed, proceeding with seizure …
Searching for highest rid pool in domain
Server “mydc01” knows about 5 roles
Schema – CN=NTDS Settings,CN=MYOLDDC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
Naming Master – CN=NTDS Settings,CN=MYDC01,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
PDC – CN=NTDS Settings,CN=MYDC01,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
RID – CN=NTDS Settings,CN=MYDC01,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
Infrastructure – CN=NTDS Settings,CN=MYOLDDC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
fsmo maintenance: seize schema master
Attempting safe transfer of schema FSMO before seizure.
ldap_modify_sW error 0x34(52 (Unavailable).
Ldap extended error message is 000020AF: SvcErr: DSID-0321041F, problem 5002 (UNAVAILABLE), data 1722

Win32 error returned is 0x20af(The requested FSMO operation failed. The current FSMO holder could not be contacted.)
)
Depending on the error code this may indicate a connection, ldap, or role transfer error.
Transfer of schema FSMO failed, proceeding with seizure …
Server “mydc01” knows about 5 roles
Schema – CN=NTDS Settings,CN=MYDC01,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
Naming Master – CN=NTDS Settings,CN=MYDC01,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
PDC – CN=NTDS Settings,CN=MYDC01,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
RID – CN=NTDS Settings,CN=MYDC01,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
Infrastructure – CN=NTDS Settings,CN=MYOLDDC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
fsmo maintenance: seize infrastructure master
Attempting safe transfer of infrastructure FSMO before seizure.
ldap_modify_sW error 0x34(52 (Unavailable).
Ldap extended error message is 000020AF: SvcErr: DSID-0321041F, problem 5002 (UNAVAILABLE), data 1722

Win32 error returned is 0x20af(The requested FSMO operation failed. The current FSMO holder could not be contacted.)
)
Depending on the error code this may indicate a connection, ldap, or role transfer error.
Transfer of infrastructure FSMO failed, proceeding with seizure …
Server “mydc01” knows about 5 roles
Schema – CN=NTDS Settings,CN=MYDC01,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
Naming Master – CN=NTDS Settings,CN=MYDC01,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
PDC – CN=NTDS Settings,CN=MYDC01,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
RID – CN=NTDS Settings,CN=MYDC01,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
Infrastructure – CN=NTDS Settings,CN=MYDC01,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=mydomain,DC=local
fsmo maintenance:

Check to role locations to verify using netdom again:

C:\>netdom query fsmo
Schema master MYDC01.mydomain.local
Domain naming master MYDC01.mydomain.local
PDC MYDC01.mydomain.local
RID pool manager MYDC01.mydomain.local
Infrastructure master MYDC01.mydomain.local
The command completed successfully.