SMTP.Com With Post SMTP

SMTP.Com is a transactional email delivery service that you can connect to WordPress through Post SMTP. This integration lets you send WordPress emails through SMTP.com’s email delivery service.

Post SMTP connects to SMTP.com through its API, so you don’t need to enter an SMTP host, port, username, password, or encryption settings.

Setting Up Your SMTP.Com Account

If you don’t already have an SMTP.com account, follow the steps below to create one:

• Go to SMTP.com and create an account.
• Verify your email address using the verification link sent by SMTP.com.
• Complete the account setup process.

Once your account is ready, you can configure your sending domain.

Verify Your Sending Domain

SMTP.com requires you to verify your sending domain before you can use it for email delivery. The verification process may require DNS records such as SPF, DKIM, and DMARC. Use the DNS records shown in your SMTP.com account because the values can vary by account or configuration.

• SPF (Sender Policy Framework) identifies the mail servers authorized to send email on behalf of your domain.
• DKIM (DomainKeys Identified Mail) adds a digital signature to outgoing emails, allowing receiving mail servers to verify that the message came from an authorized sender.
• DMARC (Domain-based Message Authentication, Reporting, and Conformance) builds on SPF and DKIM to help receiving mail servers determine how to handle messages that fail authentication checks. It also provides reporting that can help you monitor email authentication and identify unauthorized sending sources.

Add Your Sending Domain in SMTP.com

• In your SMTP.com dashboard, open Sending Email → Domain or Sending Domains, depending on your account interface.
• Add the domain you want to use as your sending domain and continue with the verification process.

• SMTP.Com will display the DNS records required for your domain.

Add the SPF Record

SMTP.com provides an SPF record that authorizes its email servers to send messages on behalf of your domain. Use the SPF record provided in your SMTP.com account rather than copying a value from this guide.

SMTP.com’s SPF configuration commonly includes:

include:_spf.smtp.com

Add the SPF Record

• Open your domain’s DNS management page.
• Create a new TXT record.
• For Host/Name, enter @ or the root domain, depending on your DNS provider.
• For Value, paste the SPF record provided by SMTP.com.
• Set TTL to 86400 seconds (1 day), if your DNS provider allows you to specify a TTL.
• Save the record.
• Return to SMTP.com and click Verify SPF.

If Your Domain Already Has an SPF Record

Do not create a second SPF record for the same domain.

Edit the existing SPF record and add: include:_spf.smtp.com

Example:

v=spf1 include:existing-provider.com include:_spf.smtp.com ~all

DKIM Record

SMTP.com also requires a DKIM record.

The DKIM value is unique to your SMTP.com account, so use the value provided by SMTP.com.

Typical record details:

• Type: TXT
• Name/Host: smtpcomcustomers._domainkey
• Value: Copy the DKIM value provided by SMTP.com
• TTL: 3600 seconds (1 hour), or your DNS provider’s default

Add the DKIM Record

• Copy the DKIM record details from SMTP.com.
• Open your domain’s DNS management page.
• Create a new TXT record.
• Enter the record name exactly as provided by SMTP.com.
• Paste the DKIM value exactly as provided.
• Save the record.
• Return to SMTP.com.
• Click Verify DKIM.

Add the DMARC Record

DMARC is configured as a TXT record on your domain.

Typical record details are:

• Type: TXT
• Name/Host: _dmarc
• Value: Use the DMARC value recommended or provided by SMTP.com
• TTL: 3600 seconds (1 hour), or your DNS provider’s default

1. Copy the DMARC record value provided by SMTP.com.
2. Create a new TXT record in your domain’s DNS settings.
3. Enter _dmarc as the Host/Name.
4. Paste the DMARC value into the Value field.
5. Save the record.
6. Return to SMTP.com and complete the domain verification.

Generate Your SMTP.Com API Key

Post SMTP uses an API Key to authenticate with SMTP.com.

• Go to Account → Manage API Key.
• Click Generate New.
• Copy the complete API Key displayed in the table.

You will use this API Key when configuring SMTP.com in Post SMTP.

Find Your Channel Name (Optional)

Some SMTP.com accounts use multiple senders or channels. Post SMTP provides an optional Channel field for these configurations.

If your SMTP.com account uses a specific channel:

• Open the Account  > Manage Channels in SMTP.com.
• Find the sender you want to use or add a new Channel.

If you do not use a specific channel, leave the Channel field empty to use the default channel

Configure SMTP.Com in Post SMTP

Use the Post SMTP Setup Wizard to configure the SMTP.com mailer.

Select SMTP.Com

Post SMTP → Dashboard → Setup the Wizard

1. Open Post SMTP → Dashboard.
2. Click Setup the Wizard.
3. Select SMTP.com from the available mailers.
4. Click Continue.

Enter the SMTP.com Configuration

Enter the following details:

From Email

• Enter the email address you want to use as the sender.
• Example: hello@yourdomain.com
• The From Email must use the domain authenticated in SMTP.com.

From Name

• Enter the name recipients should see as the sender.

API Key

• Paste the API Key generated in your SMTP.com account.

Channel

• Enter your SMTP.com channel name if required. Otherwise, leave the field empty.

Send a Test Email

1. Click Save & Continue.
2. Enter an email address that you can access.
3. Click Send Test Email.
4. Confirm that the test email is sent successfully.
5. Click Finish to complete the setup.

Verify the Configuration

After the test email is sent:

• Check the recipient’s inbox and spam folder.
• Go to Post SMTP → Email Log.
• Locate the test email and confirm that its status is Success.
• In SMTP.com, confirm that the sending domain and SPF/DKIM authentication are verified.

You’re All Set

SMTP.com is now configured as your Post SMTP mailer, and your WordPress emails can be sent through SMTP.com’s email delivery service.

If you run into issues while configuring SMTP.com or troubleshooting email delivery, contact our Support team and include a Diagnostic Report. Our team can review your configuration and help identify the cause of the delivery issue.