What are the TOP mistakes, commonly made in e-mail marketing?

Marketing e-mails need to

1. be very easy to understand. - potential customers will filter out within less than5 seconds if they want to go on reading or not
2. be free of any spelling mistakes
3. be the result of thorough segmentation to address only the real target customers
4. be sent no more than once a week, unless customers have explicitly opted in for higher frequency
5. include a clear and easy to follow call for action, have clickable links to directly access to the product(s) or offer(s) in questions
6. have an appealing look / feel / style / language to be recognised every time
7. include an opt-out link
8. include the company's contact details
9. have a link to an online version of the e-mail

Last but not least, customers must be able to click on 'reply' to get in touch with the company. It is frustrating to see under so many newsletters a note that 'this account is not monitored' and customers should not respond. Useless and not user friendly!

In Addition to what some of the other respectable people have shared. Spamming the customers/clients to death. (Annoying them beyond reason) This often results in clients unsubscribing and/or worse turning away from services.

the first misktake appears on the subject of the email, it should be attractive and brief and to target people, adding date or period is good too, for instance, if the email is about newsletter, the subject should be "Sudan development Bulletin Issue10,2014".

the second one, a clever marketer should have a list of buyers or customers, s/he should pay attention to thier needs frequently, though, emails should be grouped or segmented according to thier area of interest.

before sending emails, we should check and re-check eash information we provide and make sure its consestency, clear and complete our goals, and make shure that any related links are valid.

Most common mistakes;

(1) sending by bulk emails; with mail filters in place by most of them; the mail goes to the junk folder or reported as spam mails

(2) Too much written material without being precise and straight to the point. The email reader will not have all the time to read the whole mail; as soon as he sees its an ad sort of thing... he just goes for the delete

Through my own email marketing experience, the top mistakes would be:

Missing call to action-the e-mail message should have a measurable outcome for example you can ask the customer to like your page on Facebook , or fill a form for more details, or register for a competition or avail a special email only coupon offer. Without a call to action, the email is lost in many hundreds of emails people get every day.

HTML Email Newsletters Vs Click on Image emails: Many bulk email companies provide the option of creating two versions of the same email. One HTML  and the other is the click on the image email. It is necessary to opt for both the options since HTML emails have an issue downloading in many computers where as the image loads quickly and is easy to follow through since the image it is the clickable link.

Information overflux (too many images, too much text)

Bad formatting and grammatical errors

Spamming users who might actually be interested.

Top mistakes in email marketing:

1. Fake information about the producct is killing the trust for the supplier.
2. Un0availability of the product offers.
3. Frequency of sending email messages Silly repeating of the advertising emails

“67% of marketers say that delivering highly relevant content is a strategic goal their organization wants to achieve through email marketing.”

- MarketingSherpa, Email Benchmark Survey,2013

There are various mistakes that turns the E-mail Marketing into Total Disaster:

1. Unable to develope Proper Acquisition Strategy, that where is there brand is more lucrative on what platform like Mobiles, Tablets, Laptops and accordingly the Mail have to be designed more often Mail fail to open in various devices and thats complete disaster
2. Mobile friendly Mails, is very essential which most of the organisation does not take care of, as more than60% people in US delete the message if it is not Compatible with there phone
3. Unable to give Fair amount of essential and realistic data or information
4. Improper research related to Target Audience eventually results into the Marketing Failure and Waste of resources.
5. Unable to give a rapid change in the Design and Structure of the E-mailer, which is one of the most important factor to attract the consumer as similar messages can be more of boring

This are few Important Misatakes done in Email Marketing which I think is very essential to be taken care of apart from very basic one like Gramatical Error, Improper Salutations and etc which are also undoubtly important 

1. Data clasification (ST).
2. Marketing Message.
3. Timing.
4. proposed value within the email

Too many emails

Too much text

Too much content

I peronsally feel most email marketing efforts get bracketed due to the fact that many of us consider them to add minimal value towards achieving the success of the intended goal. I also feel many marketers either over do their efforts and come out as needy or desperate. Emails should be short, concise and up to a specific point - with the call to action being the first thing the user sees. On top of all this, if there's time, it wouldn't hurt to make the email blast look visaully appealing too.