How to check if an email source is reliable?

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Check the validity of the email source
When you send emails, making sure the sources you use are reliable and trustworthy is a concern. When you sign up for email marketing software, they usually provide a mailing list of subscribers. But you haven't yet determined if phone number data
these people are interested in your niche, or if they will open and click on your messages. Checking the validity of an email address is very simple, and it can provide valuable insights into running better marketing campaigns.

Sender reputation is one of the key factors in email deliverability
Sender reputation is one of the most critical factors for email deliverability. Google's spam filters prevent over 10 million unsafe or unwanted emails from ever reaching users. A good sender reputation helps ensure your emails reach the inboxes of your subscribers and customers. A poor sender reputation can cause your emails to be marked as spam.

Check the email headers
The first step to checking that an email is from a valid source is to check the message headers. The message headers contain information that can be used to verify the authenticity of the message. Most email providers allow you to view a copy of the email headers by visiting their website and entering your email address as a password.

SPF Check
Sender Policy Framework (SPF) is a DNS record that allows a domain to specify which mail servers are allowed to send email on behalf of the domain. Messages that fail the SPF check indicate that the sender is not authenticated.

DKIM Signature
DKIM signatures can be added to emails to verify the legitimacy of the email content. When receiving mail, it looks for the DKIM signature header in the incoming message. If the signature and the public key in the DNS record do not match, the message is considered suspicious and may be rejected or marked as spam.

DMARC Policy
If you are using DMARC, you can set up an enforced policy to ensure that only legitimate senders can trade mail from your domain and actually deliver mail to the inbox. To do this, make sure it is set to "Reject" or "Quarantine." This creates a boundary and ensures that untrustworthy email sources cannot impersonate your domain and deceive your customers.

Verification Channel
Verified channels help ensure the source of your emails. This is critical for both business and personal accounts because it protects your online privacy and security. If spammers try to impersonate your business or personal account, verified channels will reject these messages as spam and prevent them from reaching your inbox.

Check if the IP address is on a deny list or IP block list
Search for your IP address on a deny list or IP block list. If you find your IP address on their lists, people may think your emails are spam because they are coming from an IP address that has a history of being associated with spam.

Pay attention to password security
Someone else may know your email account password. This gives them access to your account and all its contents, including other people's emails. This gives them room to conduct suspicious activities on your behalf.

Check complaint and spam folders
If you're receiving a large number of complaints about your email delivery, it may be because many recipients are receiving email from an unreliable sender using your address.

Consequences of sending mail using invalid source email addresses
If your emails are blocked as spam or bounced, it damages your brand reputation. Recipients may think you need to care more about them to send emails from a legitimate source. This can affect their perception of your business, leading to lost sales and referrals.

Risk of spammers and phishers
When messages are sent from malicious sources, the original sender often puts themselves at risk for spam filters. If the filter deems their email to be spam, it may be sent directly to the recipient's spam folder or blocked entirely. In addition to inconvenience for recipients, it can have a serious impact on your business if you consistently send a large amount of spam.