How to add different signatures to internal and external emails

Learn how to configure CodeTwo Email Signatures for Office 365 to add different signatures to messages sent to internal recipients and different to messages sent outside your organization.

Email signatures used in internal and external correspondence serve different purposes. For example, when sending an email to your colleagues, there's no need to include the company information, a marketing banner or legal disclaimer in a signature. Bear also in mind that Exchange Online mailboxes have limited space, so it would be a good idea to remove any graphics from signatures added to internal emails.

For example, an internal email signature could contain the following sender's information only:

  • full name,
  • job title,
  • department name,
  • contact info/extension number,
  • other (preferably non-graphic) details.

An external email signature typically includes the following details:

  • full contact information (sender's name, job title, phone number, company address, etc.),
  • company logo,
  • marketing banner,
  • links to social media profiles,
  • legal disclaimer,
  • and more.

Basics

This article shows how to configure CodeTwo Email Signatures for Office 365 for a specific email signatures usage scenario. If you need more basic information, use the links below:

How to configure the program for this scenario

Use the links below to set up signatures for internal and external messages in:

Server-side mode

Server-side signature for internal emails

Add a new server-side signature rule (Fig. 1.) and name it, e.g. Internal signature. The rule needs to be turned on.

Adding a new server-side signature rule.
Fig. 1. Adding a new server-side signature rule.

On the Recipients tab, select Add > Internal recipients (Fig. 2.).

By using this option, the selected server-side signature rule will be applied to internal emails only.
Fig. 2. By using this option, the selected server-side signature rule will be applied to internal emails only.

On the Design tab, click Edit signature to open the signature template editor. Select one of the existing templates or create a new signature template that will be used for internal correspondence only (Fig. 3.). Learn more about how to create a signature template

Creating a signature template for internal emails.
Fig. 3. Creating a signature template for internal emails.

On the Options tab, leave the default options selected (Fig. 4.):

  • If this rule is applied > Stop processing next rules
  • If this rule is not applied > Go to the next rule

Select these options to allow the program to execute another signature rule, configured for emails sent outside your organization.
Fig. 4. Select these options to allow the program to execute another signature rule, configured for emails sent outside your organization.

Server-side signature for external emails

Add a new server-side signature rule, as shown in Fig. 1., and name it, e.g. External signature. Place the new signature rule under the rule configured for internal emails. Next, on the Recipients tab, select Add > External recipients (Fig. 5.).

By using this option, the selected server-side signature rule will be applied to external emails only.
Fig. 5. By using this option, the selected server-side signature rule will be applied to external emails only.

Go to the Design tab and create a new signature template that will be used for emails sent outside your organization (Fig. 6.).

Creating a signature template for external emails.
Fig. 6. Creating a signature template for external emails.

On the Options tab, leave the default options selected, as shown in Fig. 4., or adjust the settings to your needs.

Click Save (ESIG for O365 rule save) in the SIGNATURE RULES section to apply your changes and make the signatures available for your users.

Important

If you configured these rules according to the steps provided above, email signatures will be added to messages sent by all users in your organization. If you want to limit the scope of senders, make additional changes on the Senders tab. Learn more

Client-side mode

Client-side signature for internal emails

Create a new client-side signature rule (Fig. 7.). Provide a descriptive name, for example Internal signature. Be sure the rule is turned on.

Adding a new client-side signature rule.
Fig. 7. Adding a new client-side signature rule.

Go the Design tab and click Edit signature to select or create a signature template for internal emails (Fig. 8.). Learn more about how to create a signature template in the signature template editor

Setting up a signature template that will be added to emails sent within your organization.
Fig. 8. Setting up a signature template that will be added to emails sent within your organization.

On the Options tab, you can decide whether this signature template should be automatically added to new emails or replies/forwards in Outlook. We recommend setting the external signature template as the default one, which means you need to uncheck (clear) the checkboxes shown in Fig. 9. for the internal signature rule. 

Leave these options cleared for the signature rule applied to internal emails.
Fig. 9. Leave these options cleared for the signature rule applied to internal emails.

Client-side signature for external emails

Add a new client-side signature rule, as shown in Fig. 7. Name it e.g. External signature, so that your users can distinguish it easily from the internal signature. 

On the Design tab, create a signature template that will include all the necessary contact details and graphics (Fig. 10.).

A client-side signature template used for external messages.
Fig. 10. A client-side signature template used for external messages.

On the Options tab, select the options shown in Fig. 11. By doing so, this signature template will be added to all new emails and replies/forwards in Outlook for Windows and Outlook on the web (OWA) by default. 

We recommend selecting these options for the signature rule applied to external emails.
Fig. 11. We recommend selecting these options for the signature rule applied to external emails.

Save your changes by clicking the ESIG for O365 rule save icon in the SIGNATURE RULES section. The client-side signatures will be made available to selected Outlook and OWA users.

Important

By following the steps outlined in this article, all users in your organization will have access to these newly created signature templates (provided you deployed an Outlook signatures add-in for them). If you want to restrict this access to selected users only, specify these users or groups of users on the Senders tab. Learn more

Result

If you use the program in server-side mode, the correct signature (internal or external) is automatically added to an email based on its recipient(s) (Fig. 12.). The signature is added after the email is sent, but users can view their signature by using the signature preview add-in.

An example of a signature added to external email in server-side mode.
Fig. 12. An example of a signature added to external email in server-side mode.

Sending emails to multiple recipients

If you send a single message to 2 (or more) recipients from both inside and outside your organization, each recipient will get a different signature. Learn more about the message splitting feature

In client-side mode, the default signature for new messages is added automatically while composing an email in Outlook or OWA. If you configured the client-side rules exactly as described in this article, the external signature is added to all messages by default. To use an internal email signature, it needs to be selected from the CodeTwo Signatures pane in Outlook or OWA by clicking the Use this signature button (Fig. 13.).

Changing a client-side email signature in Outlook.
Fig. 13. Changing a client-side email signature in Outlook.

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