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--- en:email_is_marked_as_spam [2016/07/01 11:09] – bk
+++ en:email_is_marked_as_spam [2025/07/16 11:49] (current) – bk
@@ Line 1: / Line 1: @@
-====== Why is my e-mail classified as spam? ======
+====== Why is my email classified as spam? ======
-One or more of the following factors could be increasing the e-mail’s spam score and causing it to be filtered
+One or more of the following factors could be increasing the email’s spam score and causing it to be filtered into the spam folder:
-into the spam folder:
+  * **Suspicious content.** Avoid spam-typical words like Rolex, Viagra, and casino in both the subject line and the email’s content. Even words that don’t seem immediately suspicious - such as “free” - may be marked as suspicious if they appear multiple times. An "unfortunate" combination of words may also be mistakenly marked as suspicious by a spam filter, leading to an increased spam score. Most often, only a thorough test by process of elimination can identify the part of the email that led to its classification as spam.
+  * **Suspicious subject.** Avoid ,e.g., question- and exclamation marks, especially in combination with CAPITAL LETTERS, €-icon, $-icon
-  * **Suspicious content.** Avoid spam-typical words like Rolex, Viagra and casino in both the subject line and the e-mail’s content. Even words that don’t seem immediately suspicious - such as “free” - may be marked as suspicious if they appear multiple times. An "unfortunate" combination of words may also be mistakenly marked as suspicious by a spam filter, leading to an increased spam score. Most often, only a thorough test by process of elimination can identify the part of the e-mail that led to its classification as spam.
+  * **Phishing Links.** Avoid spelling out URLs as plain text in HTML emails and linking them to a tracking link.  This is common practice in phishing emails. Example: "Please register on [[http://www.trackinglink.de|www.promio.net]]". Better alternative: "Please register [[http://www.trackinglink.de|here]]".
-  * **Verdächtiger Betreff.** Vermeiden Sie z.B. Frage- und Ausrufezeichen, besonders deren Kombination, GROSSBUCHSTABEN, €-Zeichen, Dollarzeichen
+  * **Too many emails per unit of time.** Emails with identical or similar content were sent repeatedly in a short period of time (e.g., while sending test emails). Typical spam mails are often sent frequently within a short time. For this reason, some spam filters filter out emails of this kind.
-  * **Phishing Links.** Avoid spelling out URLs as plain text in html e-mails and linking them to a tracking link.  This is common practice in phishing e-mails. Example: "Please register on [[http://www.trackinglink.de|www.promio.net]]". Better alternative: "Please register [[http://www.trackinglink.de|here]]".
+  * **Unknown or suspicious email attachment.** A file attachment is regarded as a potential virus carrier.
-  * **Too many emails per unit of time.** Emails with identical or similar content were sent repeatedly in a short period of time (e.g. while sending test e-mails). Typical spam mails are often sent frequently within a short time. For this reason, some spam filters filter out e-mails of this kind.
+  * **Suspicious image-to-text ratio.** The email is graphics-intensive. Whenever possible, convey your sales message in the form of text rather than images. Use more text, small images, and as few images as possible. Of course, this must be balanced against the sales goal!
-  * **Unknown or suspicious e-mail attachment.** A file attachment is regarded as a potential virus carrier.
-  * **Suspicious image-to-text ratio.** The e-mail is graphics-intensive. Whenever possible, convey your sales message in the form of text rather than images. Use more text, small images, and as few images as possible. Of course, this must be balanced against the sales goal!
-Generally speaking, it is often difficult to reconstruct why a particular e-mail was classified as spam.
+Generally speaking, it is often difficult to reconstruct why a particular email was classified as spam.
-Frequently, the e-mail is marked according to personal rules that the e-mail client in question (e.g. Outlook) has learned over time.
+Frequently, the email is marked according to personal rules that the email client in question (e.g., Outlook) has learned over time.
+If newsletters are not delivered without returning a bounce message, there can be several reasons for this.
+Here are some of the most common:
+  * **Spam filters intervene silently**. Use of spam filters that may discard mails directly without notifying the sender - a so-called “silent drop”.
+  * **Domain-based blocking**. If the domain used is on a blocklist or has a poor sender reputation score, it is often blocked without bounce.
+  * **User complaints**. If many recipients mark emails as //junk//, this can lead to a temporary blocking of the sender without bounces occurring.
+  * **Non-valid source code**. Sometimes the source code of a message can lead to problems with delivery. You can check whether the source code is valid, e.g. in the online validator of the W3C [[http://validator.w3.org|validator]]. \\
 <WRAP round tip 90%>
-We recommend viewing quality control before dispatching an e-mail. Check the integrated phishing control of the links as well as the spam score and the SpamAssassin alerts. Most e-mails receive a maximum spam score of 3 points.
+We recommend viewing quality control before dispatching an email. Check the integrated phishing control of the links as well as the spam score and the SpamAssassin alerts. Most emails receive a maximum spam score of 3 points.
-Also, the advance control via spam filter test (in the preview block found in the e-mail details) can give you an impression of which clients are likely to classify the e-mail as spam.
+Also, the advanced control via spam filter test (in the preview block found in the email details) can give you an impression of which clients are likely to classify the email as spam.
 </WRAP>
+<WRAP round tip 90%>
+In this article you will find some suggestions on how you can optimize the deliverability of your emails: //"[[en:optimize_deliverability]]"//.
+</WRAP>
+{{tag>deliverability complaints spam_filter inbox_previews feedback_loops }}

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