Exchange 2013 external emails be sent are limited

We are running exchange 2013 and we have users sometimes that want to send out emails to 100 external accounts but they don't go out.
What is the limit for sending external emails in bulk with exchange 2013 and what can I do to check what ours is set to and how can I increase this if possible
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vmichAsked:
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timgreen7077Exchange EngineerCommented:
The default number of recipients is 5000 so if sending to 100 people that shouldn't be a problem. In exchange admin center go to Mail Flow > Send Connectors > click more (indicated with 3 dots ...), > Organization Transport Settings and under Limits it will show the number of recipients. Is the sender receiving any bounce backs or anything?
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vmichAuthor Commented:
If the default is 5000, how come when a user sends out emails to external accounts with around 100, they don't go out?
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timgreen7077Exchange EngineerCommented:
what happens? is there an error and bounce back or what.
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MichelangeloConsultantCommented:
Limits may vary depending on your infrastructure and the email client. Limits posed on individual mailboxes take precedence.

individual mailbox
get-mailbox targetmailbox | fl *recipi*

Open in new window


Receive connector (smtp)
get-receiveconnector "*Client Frontend*" | fl *recipi*

Open in new window


Organization:
Get-TransportConfig | fl *reci*

Open in new window


Defaults are:

Maximum number of recipients per message through a Receive connector
Transport service on Mailbox servers
5,000 for the Default Receive connector
200 for the Client Proxy Receive connector
Front End Transport service on Client Access servers
200 for the Default Frontend, Client Frontend, and Client Proxy Frontend Receive connectors.
Note:
If the number of recipients is exceeded for an anonymous sender, the message is accepted for the first 200 recipients. Most SMTP messaging servers detect that a recipient limit is in effect. The SMTP messaging server continues to resend the message in groups of 200 recipients until the message is delivered to all recipients.

Find here references
https://technet.microsoft.com/en-us/library/bb124345(v=exchg.150).aspx

"Recipient limits  
 These limits apply to the total number of message recipients. When a message is first composed, the recipients exist in the To:, Cc:, and Bcc: header fields. When the message is submitted for delivery, the message recipients are converted into RCPT TO: entries in the message envelope. A distribution group is counted as a single recipient during message submission.

Scope of limits Following are the basic categories for the scope of the limits available for individual messages:
Organizational limits   These limits apply to all Exchange 2013 Mailbox servers and Exchange 2010 and Exchange 2007 Hub Transport servers that exist in the organization. If you have an Edge Transport server installed in the perimeter network, the specified limits apply to the specific server.
Connector limits  These limits apply to any messages that use the specified Send connector, Receive connector, Delivery Agent connector, or Foreign connector for message delivery. Send connectors are defined in the Transport service on Mailbox servers and on Edge Transport servers. Receive connectors are defined in the Transport service on Mailbox servers, in the Front End Transport service on Client Access servers, and on Edge Transport servers.
Active Directory site links   The Transport service on Mailbox servers use Active Directory sites and the costs that are assigned to the Active Directory IP site links as one of the factors to determine the least-cost routing path between Mailbox servers in the organization. You can assign specific message size limits to the Active Directory site links in your organization.
Server limits   These limits apply to a specific Mailbox server or Edge Transport server. You can set the specified message limits independently on each Mailbox server or Edge Transport server.
In Outlook Web App, the maximum HTTP request size limit setting on the Client Access servers also controls the size of messages that Outlook Web App users can send.
User limits   These limits apply to a specific user object, such as a mailbox, contact, distribution group, or public folder."


Note that if your AD is (or comes from ) windowss 2003 server, you may be subject to the following
https://technet.microsoft.com/en-us/library/bb310760(v=exchg.141).aspx
Active Directory also has a global limit for the maximum number of recipients per message. This global limit is separate from the limits that can be managed by using the EMC or the Shell. This global limit is used in Microsoft Exchange Server 2003, but it also has an effect in Exchange Server 2010. If the global limit in Active Directory and the organization-level limit in Exchange 2010 are in conflict, the smaller of the two is used as the effective limit.
To modify the global limit in Active Directory, you must use Exchange System Manager (in Exchange 2003) or ADSI Edit.
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vmichAuthor Commented:
default recp 5000
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