TIBCO Hawk 5.1.1 Hotfix 03 is released for all supported platforms. Listed below is a summary of updates included in this Hotfix. Please refer to the attached Readme for additional details.
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Closed Issues in 5.1.1.hotfix03 (This Release)

HK-5765
For the EMail action of a rulebase, you can now configure the content 
type of an e-mail to text/plain. To do this, add the following property 
to the the RuleBaseEngine module of the hawkagent.cfg file: 
-email_content_type text/plain

HK-6008
When TIBCO Hawk was used along with Console Applications like TIBCO 
Hawk(R) SNMP Adapter and the fault tolerant mode of TIBCO Enterprise 
Message Service, Hawk SNMP Adapter could not connect to the secondary
EMS server when the primary EMS server was down. With this fix, Hawk 
SNMP Adapter can connect to the secondary EMS server. Hawk SNMP Adapter
can also reconnect to the primary EMS server in a non-fault-tolerant 
EMS setup.
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Known Issues in this Hotfix: None
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This hotfix can be downloaded from TIBCO Support Customer Portal Web UI(https://support.tibco.com). You will need to provide your TIBCO Support Portal credentials. Once logged in you can download the hotfix by selecting the “Downloads” -> “Hotfixes” option under:

/AvailableDownloads/Hawk/5.1.1/hotfix3/

For instructions on "How do TIBCO customers access Hot Fixes or Engineering Builds or customer-specific files" ., you can refer to Published Article 000022290 :  https://support.tibco.com/s/article/hotfix

Please contact TIBCO Support if you have any problems finding or downloading this hotfix.

Install Hotfix.