
How can I benefit from this?
Outlook (client-side) signatures configured in the Signatures app (app.codetwo.com) will now also apply to emails composed in Outlook on smartphones and tablets. The signature adding process is fully automated – our Web Add-in inserts the correct signature into an email as soon as users start typing it in Outlook. Users can have a different signature set up for new emails and a different one for replies/forwards. Here’s how it looks for new messages:
Of course, all CodeTwo Outlook signatures continue to work with Outlook for Windows, Outlook for Mac and Outlook on the web / OWA as before.
How to turn on Outlook mobile signatures
Watch our quick video below or read on to find out how to enable Outlook mobile signatures.
First, make sure you use the most recent version of Outlook for iOS and Android with a Microsoft 365 subscription.
Also, to use the Web Add-in, CodeTwo Email Signatures 365 needs to work in Outlook (client-side) or combo mode.
New CodeTwo customers (from July 2024 onwards) will have mobile signatures turned on by default, and existing customers will get them in the upcoming weeks. If you don’t want to wait for the automatic rollout, you can turn on mobile signatures for your Microsoft 365 tenant right away. Here’s how to do it:
Sign in to CodeTwo Admin Panel, select your tenant on the Tenants page and go to Outlook add-in. Next, turn on Add CodeTwo signatures also in Outlook for iOS and Android. Note that it might take up to 4 hours for this change to take effect across all users.

For more detailed instructions, see our manual.
To find out more about using CodeTwo Outlook Web Add-in on mobile devices, see this article.
CodeTwo Email Signatures 365 is the only fully Microsoft 365 Certified email signature solution (the entire infrastructure reviewed & pen-tested by Microsoft). It's an Azure-based cloud service that supports all devices and email apps. Co-engineered and awarded by Microsoft, it also holds the highest user satisfaction ratings. With ISO 27001 & 27018 certification and a proprietary 4-layer security system, it's the most secure signature manager on the market. Watch a short product video
CodeTwo offers solutions for organization-wide email signature management, data backup and migration for Microsoft 365 & Exchange Server, developed since 2007 and used by over 140k organizations worldwide, including Facebook, Samsung and UNICEF.



Can I confirm that mobile emails with signatures are applied client side and not routed to another server?
In general, emails with client-side signatures will not be rerouted, mobile or not. Here’s a detailed explanation:
In Outlook (client-side) mode, signatures are always added directly in Outlook. These emails are never routed through the CodeTwo signature service.
In combo mode (a mix of cloud and Outlook modes), how signatures are added depends on your setup. If a user has their Outlook signature applied by the CodeTwo add-in, their email will not be routed through the CodeTwo signature service. Emails are routed through our service only if a CodeTwo signature is not added directly to the email, for example, when someone uses an unsupported email app or older versions of mobile Outlook.
If you want to dive in a little deeper into how CodeTwo Email Signatures 365 works, here’s a good resource. You can also contact us directly anytime, we’ll be happy to answer any questions.
We have it set so that that signatures are onyl automatically applied to or signatures to be automatically sent on new messages. On mobile, is there a way for users to add a signature to a reply on an ad hoc basis?
Unfortunately, due to Outlook API limitations, there is no way to manually choose and add a CodeTwo signature on mobile Outlook – there’s no signature pane you can access there.
That’s where CodeTwo cloud signature mode comes in handy – in the cloud signature rule, you can set up separate signature designs for the first and the subsequent emails in a thread, so that replies can get a simpler, minimalistic signature design automatically.
If you want to discuss this further, provide more context and look for another solution, contact us!
Is there a way to remove ‘Signature has been inserted by CodeTwo’ the yellow banner? Thanks!
Hi Michelle,
There is a didecated option in CodeTwo Admin Panel. Learn more in our manual.
We’d love to see an option to set a different default signature for mobile devices. We’ve had to exclude a few users from CodeTwo entirely because they really want a “sent from mobile, please excuse typos” kind of message. A Logic selector for Mobile, similar to the “Set this signature as default for replies” would be ideal.
Hi Dave,
We have this feature on our radar but can’t provide any specific date yet. Stay tuned for updates. For the time being, I can suggest a workaround: you can create a separate signature rule for the users in question and uncheck the Set this signature as default for new messages and Set this signature as default for replies and forwards options in the Logic step. This way, those users will still get their custom signatures (e.g. “Sent from my phone”) when sending emails from Outlook mobile. The only downside is that they won’t get automatic signatures in Outlook desktop & OWA (they will need to add a signature manually from the add-in’s pane), but at least you don’t need to exclude them entirely from CodeTwo.
Howdy team,
This is incredibly exciting. I wanted to ask, what is the expected behaviour if I have two separate M365 tenants both using codetwo?
In Outlook mobile, will it pick up the right signature based on the email I am emailing from please?
Thanks,
Stuart
Hello Stuart,
Yes, that’s exactly how it works. But to get the right signature, be sure to switch the Outlook account BEFORE you are composing your message. Changing the account in the From field, while composing an email, will not change the signature (this is a native limitation of Outlook mobile apps).
The signature has to be a default signature to be automatically added to the mail. Is there a way to choose between different signatures?
Hello Daniel,
Due to the limitations of Outlook mobile apps, each user can only have one default Outlook (client-side) signature set up for new emails and one for replies/forwards. Natively, it is possible to set up only one email signature in Outlook mobile. For more details, see our manual and this KB article.
Awesome, I have been waiting for this. :)
With this setting enabled my signature does not format on my Android the same as it does through the client-side configuration.
It drops the phone numbers and alignment is all over the place.
While I would love to implenet this, I can’t switch this on as a result of these issues.
This is a mobile Outlook bug which will be addressed by Microsoft. Additional Information: https://github.com/OfficeDev/office-js/issues/4079
Hi Stephen,
I’m not sure this works when “quick” replying to an email. You need to expand the reply section (clicking the expand arrows on the top right corner) for the reply signature to be inserted. Other than that, works great.
Hello Jose,
An email signature is not shown in the quick reply box, but it is still added to the email being composed. You can click the mentioned expand arrows to view the signature – this will open the full compose view. This is by design, due to the limitations of Outlook mobile apps. If you don’t want to open the full compose mode only to make sure a signature was added to your email, your admin can enable add-in notifications for Outlook mobile apps.
Really great work.
Hi. In reference to this statement “Note that it might take up to 4 hours for this change to take effect across all users.” how would I enable this feature for only some of the iOS users instead of all of them?Thanks.
Hi Stephen,
You can specify users that will get automatic signatures in Outlook when deploying CodeTwo Outlook Web Add-in (as described in our manual). However, this applies to all versions of Outlook (desktop, mobile and OWA). In other words, it is not possible to enable the add-in in Outlook mobile for one group of users and the add-in in Outlook desktop & Outlook on the web to a different group. This is a native limitation of Exchange Online and there is no workaround for the time being.
Amazing