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How to prevent email from being considered spam

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How to prevent email from being considered spam: It has now been two hours since you sent your best friend Luca the email containing the invitation to next Saturday’s party. However, he has not answered you yet and you are wondering why he is behaving this way: one reason could be that the message you sent him ended up in spam and, therefore, he has not even read it. . How do you say? Would you like to prevent such a thing from happening again in the future? So let me tell you how!

In today’s guide, you will find a more than exhaustive explanation on how to prevent the email from being considered spam: I will show you both how to proceed with regard to forwarded and received messages. You will see: by paying attention to a few small tricks, you will minimize the chances that the messages sent to your friends will end up directly in the “dustbin”.

So, are you ready to get started? Yup? Fantastic! All you have to do is make yourself comfortable, take all the time you need to focus on reading the next few lines and, more importantly, implement the suggestions I will give you. There is nothing left for me to do but wish you happy reading!

How to prevent the sent email from being considered spam

You wish to know how to prevent the sent email from being considered spam? Be aware that there are some practical steps you can take to minimize these possibilities. A few examples? Use the SMTP server of the domain, make sure that the mail server used has not ended up in a blacklist and pay attention to the content of the messages sent to avoid that they are mistakenly classified by the spam filters as junk mail.

Use a professional SMTP server


Use a professional SMTP server it is essential to prevent your outgoing emails from being “tagged” as spam, especially if you intend to send newsletters, perhaps to conduct real email marketing campaigns. One server SMTP (Simple Mail Transfer Protocol) is the one that deals with the actual delivery of messages sent via email, if you want to make a comparison you can compare it to the figure of the “postman”.

The “common” providers (eg. Gmail, Outlook, Free, Yahoo!, etc.) allow you to send a limited number of messages and it is for this reason that, if you want to send newsletters and avoid being classified as a “spammer”, the use of a professional SMTP server is practically essential. To use one you can contact ad hoc services such as Sendinbluea very famous email marketing service (but also SMS marketing) used daily by 100,000 users in more than 160 countries around the world including professionals, startups, established companies, online shops and NGOs.

Sendinblue allows you to send 300 free emails per day and to access advanced tools as a practical drag and drop editor for the creation of newsletters, a CRM (Customer Relationship Management) to manage relationships with customers and future customers, a system of automation of segmentation to send communications addressed to specific types of public, advanced statistics (with also geographic information), transactional emails and tool of retargeting to win back old customers. It complies with rules of the GDPR on the processing of personal data and integrates with numerous services, products and social networks.

In addition to the free plan, it has several modular, paid plans, suitable for everyone: that one Quarrel it costs 19 euros / month for sending 20,000 emails (without daily caps) and up to 69 euros / month for sending 100,000 emails. It includes email support (in Italian) and extra unlockable paid features, such as removing the Sendinblue logo from messages and A / B testing. Alternatively there is the plan Premium which starts from 49 euros / month for sending 20,000 emails and goes up to 499 euros / month for sending 1 million emails. It also includes landing pages, A / B testing, Marketing Automation, Facebook Ads, multi-user login and does not feature the Sendinblue logo in sent messages. Finally, there is the plan Agency with personalized email volume, priority sending, over 20 landing pages, over 10+ users, SSO (SAML), account manager and priority support.

To use Sendinblue, all you have to do is visit the main page of the service and fill in the registration form that is proposed to you or, alternatively, click on the button for sign in with Google. Once this is done, open theverification email you received, press on button to verify your identity and fill in the new form that is proposed to you with yours personal data and those of yours agency.

Once you have passed this step, check the box for accept the General Conditions and the Antispam Policy And check your mobile number, using the special code you receive via SMS. This will open the Sendinblue dashboardthrough which to create and manage your campaigns.

To import contacts, go to the menu Contacts (above) and click the button for import contacts. You will be able to upload a CSV / TXT file or copy and paste contacts from an Excel file. To create the email campaign, instead, go to the menu Campaigns (above), click the button for create an email campaign and fill in the fields related to first name, object, text preview, e-mail And sender name. Then choose whether to use thedrag and drop editor (I recommend it), theadvanced text editor or if paste the code. You can then choose the list of recipients and set day / time of sending.

To adjust the SMTP settings, go to the menu Transactional, at the top, and follow the wizard. To access the more advanced settings, select the item instead Parameters from the side menu, on the same page. For all the details, check out my tutorial on Sendinblue and the official service documentation.

Make sure the server is not on a blacklist

Another useful trick to prevent emails sent from ending up in spam is make sure the mail server is not blacklisted, which is a database used by mail servers that lists addresses classified as “spammers”. If you end up in one of these “blacklists” you may have a lot of trouble sending mail messages to other users.

To make sure that the server of your email address has not been included in a blacklist, you can use one of the many online tools that allow you to do this kind of checks. One of them is DNS Stuffwhich lets you know if the ID of your mail server has ended up in a blacklist and, if so, provides links to the pages containing the instructions to remove it from the latter.

To use DNS Stuff for this, log in to This Pagelocate the box Spam Blacklist Lookup located within the section Email Toolspaste theserver IP address (ex. in the appropriate text field and presses the button (▶ ︎).

If the server IP is on a blacklist, follow the instructions on the “blacklist” page to which you will be redirected or contact your provider directly to resolve the situation.

Curate the content of the email

In analyzing emails, spam filters screen a whole host of features that are common to the vast majority of “junk” messages. This is why it is important to take care of the content of emails: otherwise you run the risk of being classified as a “spammer” even if you are not.

One of the most important precautions concerns include “pure” text: Even if you insert some text written in HTML, it is very important to include always a part of text only to make sure that the message is read also by those who cannot visualize it correctly in HTML. If you ignore this advice, the spam filters used by the recipients of the message may classify it as spam.

Also be thrifty in using images: if you use too many, you could set off an alarm bell in the spam filters and thus risk ending the message sent in the “trash”.

Lend then pay attention to the words used in the subject of the message and in its entire body, avoiding “dangerous” terms (for example those used to promote pharmaceutical products, services for adults and so on). Also beware of grammar and spelling errors: if present, spam filters may insert messages in which they are present in junk mail. In this regard, it is better to re-read the message (also to avoid bad figures!).

Try forwarding the email

After applying the “tips” I gave you in the previous lines, I suggest you try forwarding the email you want to send to one or more recipients (especially if you have run into this kind of problem in the past) to to make sure everything is okay.

To perform this test, send an email to (or to one of the addresses you find in This Page, based on the type of verification you want to carry out). Within a few seconds you will receive a message with the subject Authentication Report: in the received email you will be indicated if the email is considered spam or not.

How to prevent the received email from being considered spam

You want to avoid that the received email is considered spam? It may seem trivial to you, but the best way to do this is to add the sender to your contacts. To do this you simply need to log into your mailbox, locate the message that was sent to you by the sender you want to add to your contacts (it could be in the folder Spam or Junk Mail), press on his email address (located in the field From:) and then add it to your contacts using the appropriate option (eg. Add to address book, Add to contact, Create a new contactetc.).

From this moment on, all the emails you will receive from the sender added just before the contacts will no longer be classified as “spam”. If you do not want to add an email address to your contacts, perhaps because it is a message from a newsletter you are subscribed to, you can use the function No spam made available by all major e-mail providers in their respective Webmails. To use it, log in to your email address from browser, access the folder Spam or Junk Mailopen the message from the recipient that you do not want to be considered as spam and presses the button Not spam, It is not spam, Reliable, etc. (depending on the provider used)