Setting Up SMTP Providers

Modified on: Wed, 28 Jan, 2026 at 7:26 AM

A List of SMTP and IMAP Server:

https://www.arclab.com/en/kb/email/list-of-smtp-and-imap-servers-mailserver-list.html

Sender Email Address Configuration Limitationwhen Using Your Own SMTP Provider:

If you are using an SMTP provider, make sure the sender email you mask here matches the email you integrated with. Learn more on how to configure the sender’s email address here. If the sender’s email does not match with the SMTP integrated email, or if the sender’s email is not verified with your SMTP provider, it will fail to deliver.

To test if the integrated SMTP integration work:

When sending an email, we will need to update the sender’s email address so it matches the integrated SMTP email.

In manual conversation, the sender email is set to be the user login email, we will need to set the email below to match with the SMTP integrated email. By default it will show your login email here:

Daily limits on how many emails can be sent:

Your SMTP provider may have daily limits on how many emails can be sent. Gmail, for example, has a limit of approximately 100-150 emails per day when connected to the server from a remote email client .

Learn more about Why Can’t I use My Free Email Address As The SMTP?

Workflow/Email Statistics

We will not be able to fetch delivered/bounced stats to display them. SMTP integration will show opened and clicked only. We highly recommend setting up Mailgun or LC Email to show statistics. Learn more about Troubleshooting Email Stats.

Common issues when settings up SMTP providers:

Make sure Email Re-Billing is disabled while we make changes to the default provider
please try to use the gmass tool with the same input and see if that works: https://www.gmass.co/smtp-test

Help docs on setting up SMTP providers:

Google: Using Google/Gmail/GSuite as your SMTP Provider

Setting alias for Google smtp

Yahoo: Yahoo temporarily disabled their SMTP and there’s no ETA on when it will be available again.

Sendgrid: Using SendGrid As The SMTP Provider

Zoho: Using Zoho as your SMTP Provider

In regard to setting up Amazon SES:

Use the correct server name listed on the SMTP Settings page
Use port 465
Use the IAM Username & Password you created ( and hopefully saved because you can’t view it again )
Use the Amazon AWS Root User Email Address

Amazon SES Quick Start

https://docs.aws.amazon.com/ses/latest/DeveloperGuide/quick-start.html

Managing Your Amazon SES Sending Quotas
https://docs.aws.amazon.com/ses/latest/DeveloperGuide/manage-sending-quotas.html

Moving Out of the Amazon SES Sandbox
https://docs.aws.amazon.com/ses/latest/DeveloperGuide/request-production-access.html

In regard to setting up Outlook / Microsoft Office 365:

It is common to get the error Authentication unsuccessful even though the two-step verification is OFF. Microsoft changed its security. Now a third-party app requires SMTP Authentication to be enabled. Here is the guide to enabling SMTP https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-microsoft-365-or-office-365

If the above article is not helpful, please reach out to Outlook support to get the account authenticated.

Why SMTP email is stuck in sent status

In the case of SMTP, we currently receive only sent, open, and click events. A delivered event is not available from the SMTP provider.

Because of this limitation, the system marks an email as delivered only after an open event is received.

That’s why the email initially shows as sent. Once the recipient opens the email, the status updates accordingly.

FAQs:

Q: The “Add Service” button is missing in the Email Services SMTP services tab, how do I fix this?

A: Switch to Agency View Sub-accounts Click on the three dots Manage Client

Click on Advanced Settings Make sure the “Disable the Add Email Service button in the sub-account Email Services Settings” is off

Q: How many SMTP service providers can we have on a sub-account?

A: A sub-account can have multiple SMTP service providers. However, the same SMTP credentials cannot be added more than once, so using the same email ID with different integrations is not allowed. Additionally, the same provider (e.g., Gmail) cannot be added twice.

Hide The SMTP Setup Help Doc Link

Setting Alias for Google SMTP

Where Can I Find My Dedicated Domain SMTP Credentials?
Why Can’t I use My Free Email Address As The SMTP?
Sending Priority - From Name & Address
Using Google/Gmail/Google Workspace as your SMTP Provider
How to send a test email in the Conversation
Using Zoho as your SMTP Provider