Why are SendGrid Emails Going to Spam, and How to Fix That?

Dariia Leshchenko
Oct 28, 2022
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The email marketing revolution is at its fullest at the moment. Yet, with such a plethora of competitors invading every field, you may want to ensure that every carefully crafted message is delivered so it can be heard. Whether you realize it, it is a more challenging task than you can imagine. Countless spam filters and process errors may keep your emails from ending in the primary folder. So, how do you know that your SendGrid emails are going to spam, and what should you do to fix and prevent the issue from occurring? Our professional Folderly guide will point you in the right direction.

What is SendGrid?

If you are new to the industry, you may have a vague idea of what SendGrid is and what services it provides. Simply put, SendGrid is an email delivery platform. The tool covers professional email delivery, reliable deliverability stats, in-depth email campaign analytics, and valuable solutions to solve any potential matter arising.

Why are my SendGrid emails going to spam?

Even though SendGrid is one of the most reliable email service providers available on the market at the moment, various email issues may still occur. That is why you must have a ready-made answer to the question – Why are my SendGrid emails going to spam? Spoiler alert – there is more than one reason.

Missing permission

One of the primary reasons your SendGrid emails end up in spam is that you don’t have user permission to go to the primary inbox. If the recipient you target hasn’t signed up for your services and barely knows the area you represent, the chances that they will flag you as spam will skyrocket.

Invalid sender information

Some people falsely assume that the recipient information is the only critical data to consider. However, if you provide misleading details about where the email is coming from, the spam filters will speedily detect it and ruin your deliverability rates in no time.

No physical address provided

As surprising as it seems, aside from valid digital sender info, you must supply your emails with a physical address. Whether it is a street address, post office box, or private mailbox data – it has to be available at the bottom of your email. If you provide no proof of traceability, a picky spam filter will blacklist your messages.

Spammy words

Most spam filters evaluate the content you share with the potential client base. Thus, if you pack your message with all sorts of spammy words, the chances that it will get into the primary inbox are slim. Keep away from overly salesy jargon, and try to make every email sound genuine and individual.

Weak subject line

The first thing that your recipients notice is the subject line your message comes with. Thus, if it is too weak, too pushy, salesy, or full of errors, the receiver may flag it as spam just out of suspicion. Countless methods and tools can assist in creating safe and user-oriented subject lines to keep you clear of spam folders.

Added attachments

While visual appeal comes of utmost importance, it is advised to think twice before sending an email attachment. Some filters are programmed to react to those negatively since, in a variety of cases, including attachments carry all sorts of hardcore threats. Besides, attachments are among the primary reasons an email does not load fast.

Missing opt-out links

It happens so that a user may want to terminate the relationship with your business. You shouldn’t be reluctant to let such customers go. Thus, adding an opt-out link to the email will save you the trouble of dealing with growing spam reports.

Interaction with inactive addresses

It takes tremendous time and effort to gather active user information, and some vendors choose to cheat a little and buy pre-composed mail lists. The trick with those lists is that they contain a considerable amount of incorrect or inactive addresses. The more you send to those addresses, the lower your reputation will get, and your messages will be sent to the spam more often.

Grammar and spelling issues

In case you don’t know, most of the phishing emails are hastily composed since there is a different purpose they pursue rather than delivering information. That is why, if you share poorly written content with your user base, you will attract the attention of spam filters in no time.

How do you know if your SendGrid emails go to spam?

You can take the long road and try to monitor any analytical changes that happen during the campaign. Or, you can take a smart path and implement a spam email test into the process. Many tools available will test your spam score so that you are sure how to fix and eliminate the issue. A word of advice, if you see that your open rates drop to 15% or lower, you should hit the alarm button immediately since the chances that your emails end up in the spam folder are grand.

How to avoid emails going to spam with SendGrid?

Even such a reliable service as SendGrid can’t guarantee that your emails will pass unnoticed by every known spam filter. That is why you should take some steps to assist the software in use. Use these tips to your advantage and watch the conversion rates along with the revenue skyrocket:

  • Create your mailing lists – as it’s been mentioned, pre-bought email lists contain a lot of corrupt information. That is why you should hand-pick each user address you plan on reaching out to. Such an organic list will bring in more positive results than any rented or purchased one.
  • Exploit the benefit of double opt-in – such an approach usually ensures that only those genuinely interested in your services end up on your mailing list.
  • Email authentication – it takes time and effort to authenticate your emails properly. However, once inbox providers realize that you are the person you claim to be, they will be more cooperative and send your messages to the primary inbox instead of the spam folder.
  • Clean your lists – the fact that you have an organic list at hand does not mean that people drop out of it eventually. That is why cleaning your lists now and then is recommended to eliminate inactive and obsolete addresses.
  • Watch your domain reputation – the moment your domain reputation starts being questioned, your spam score will increase. That is why it is essential to keep clear of blacklists and whitelist your domain the moment you figure out it’s blocked.
  • Cooperate with Internet Compliancy Laws – research the existing laws and try not to break them in the process.


SendGrid is one of the most requested email service providers on the market at the moment. However, using the tool does not mean your emails can pass spam filters unnoticed and get right into the primary inbox. You have to ensure that there are no hidden spam triggers in your messages. Once you eliminate the last spam-triggering element from your campaign, you will see your scores improve in no time!

Dariia Leshchenko
Dariia Leshchenko
Customer Success Manager
Dariia's decades in Email Deliverability and Sales have allowed her to successfully manage diverse business clients. For years now, she proves that there are no issues not to be fixed. Dariia speaks for the synergy of new-level email analysis technology and a human approach to improving email performance.