1 Users can block senders and domains themselves using the Block sender button on mails, or the list directly, under Manager:Filter. 2  Runbox enforces strict quotas on outgoing email and does not allow trial users (those who have not yet paid for their account) to send email to more than 20 recipients per day.
https://runbox.com/email-school/what-is-spam-and-how-to-avoid-it/
1 If the from address for example is on the format something-fjtr@runbox.com or gshyt4j5kkds7j6@runbox.com, this is a fake, made up address, and there is nothing much we can do about it. 2  To see what a real Runbox header looks like, click here.
https://runbox.com/email-school/what-is-spam-and-how-to-avoid-it/
Do’s. 1  Use the Runbox spam filter and virus filter. 2  Maintain your trainable spam filter by always correcting it when it misclassifies a message. 3  See the Filter Help page for more information. 4  Always check the sender and recipient information of suspicious messages.
https://runbox.com/email-school/what-is-spam-and-how-to-avoid-it/
Email spam, also known as junk email or unsolicited bulk email (UBE), is a subset of electronic spam involving nearly identical messages sent to numerous recipients by email.
https://en.wikipedia.org/wiki/Email_spam
Look for the “Your Name”. (More Outlook info here). How to change in Gmail: Click Settings (top of page), then Accounts, then “ edit info ” and change your “ Name ” (for advanced users, in gmail you can also change your actual from email address AND your reply to email address). Cheers to pretty email headers! Other tips for email headers: Change Your Email Headers to Ensure….
http://varbuzz.com/2008-09/does-your-email-look-like-spam-email-headers-matter/
Again, look at my actual inbox: With 100-200 emails per day, and many of those being spam with fake names, it is very difficult to memorize who works for what company. And if you want your email to be read first, then make it easier to speed read in a flash.
http://varbuzz.com/2008-09/does-your-email-look-like-spam-email-headers-matter/
Image spam, or image-based spam, is an obfuscating method in which the text of the message is stored as a GIF or JPEG image and displayed in the email. This prevents text-based spam filters from detecting and blocking spam messages. Image spam was reportedly used in the mid-2000s to advertise  pump and dump  stocks.
https://en.wikipedia.org/wiki/Email_spam
One subset of UBE is UCE (unsolicited commercial email). The opposite of spam, email which one wants, is sometimes called ham. Like other forms of unwanted bulk messaging, it is named for Spam luncheon meat by way of a Monty Python sketch in which Spam is depicted as ubiquitous and unavoidable.
https://en.wikipedia.org/wiki/Email_spam
1 Do not open suspicious-looking email or attachments. 2  It might contain harmful viruses that can infect your computer and use it to send spam. 3  Do not make purchases based on spam messages you receive, thus eliminating the spammers’ economic foundation.
https://runbox.com/email-school/what-is-spam-and-how-to-avoid-it/
Spam and viruses. Spam is increasingly sent from computers infected by computer viruses. Virus-makers and spammers are combining their efforts to compromise innocent computer users’ systems and converting them into spam-sending “drones” or “zombies”.
https://runbox.com/email-school/what-is-spam-and-how-to-avoid-it/
what does a spam email look like
A spam email look like bulk message.   The spam email look like Bulk messaging.