Včasih je potrebno poslati veliko količino podatkov kot priponko (na primer zbirko fotografij visoke ločljivosti ali projekt, na katerim delate). Poštni strežniki (tako vaši kot prejemnikovi) imajo ponavadi omejitev velikosti priponk. Največja dovoljena velikost je odvisna od stržnika, glede na njihovo posamezno nastavitev. Na primer Comcastova največja velikost za programske pakete je okoli 10.9 MB, medtem ko Gmail omogoča priponke do 25 MB.

Če ste presegli omjitev strežnika, boste dobili sporočilo o napaki podobno spodnjemu:

Poleg omejitev strežnika morate tudi upoštevati, koliko časa traja pošiljanje soročila iz vašega računalnika na strežnik in potem prenašanje iz strežnika k prejemniku. Pošiljanje in prenašanje sporočila z veliko priponko bo trajalo dolgo časa in med prenašanjem lahko blokira druga opravila.

V splošnem ja najbolje zmanjšati velikost priponk na minimum. Če to ni mogoče, lahko priponke namesto pripenjanja k sporočilu pošljete na zunanjo shrambeno storitev.

Za pošiljanje velikih priponk sledite tem nasvetom in navodilom:

Check the size of your attachment(s) while composing

When you add attachments to a message, watch the total size of your attachment(s). The total size of each attachment and the sum of all attachments is displayed in the attachment panel as shown below:

Legend:
1 - total number of attachments
2 - total size of attachment
3 - size of each individual attachment

Reduce the size of attachments

Resize and compress images

High resolution pictures take a lot of disk space. Therefore, it is better to send a low resolution version of a photo instead of the original.

There are several ways to do this:

• Use a photo manager to send photos, which will usually have an option to resize before sending. Most operating systems include a photo manager, and there are many photo management tools available for free download.
• On Windows, select images using Windows Explorer and choose "Send to". Windows will automatically offer to compress the pictures.
• Install one of several Thunderbird add-ons that will automatically resize images:
  • Auto Resize Image
  • Shrunked Image Resizer

Compress (zip) your data

For binary files that are not images (such as text documents or spreadsheets), you can "zip" files that you attach to your message ("Zip" is a common data compression and archive format. Files that have been zipped have a ".zip" extension).

This can be done either:

• manually with one of the many free zip tools available for all operating systems.
• automatically with the help of the Auto Compress File add-on.

Use an external storage service

There are several websites that provide online file storage. You can upload your files to these sites and enable other people to download them. Rather than sending a file attached to a message, you can simply send a message that includes a link to the file which the recipients can download at their convenience.

You should carefully read the terms, conditions, and privacy statement of the file sharing service before you use it.

Photos sharing service

If you want to share pictures or videos only, you can use one of several photo sharing services (such as Flickr, PicasaWeb, Facebook, etc.).

Online file storing and sharing service

These services are primarily used to store data on the internet. However, they can also be used to share your data, as the files can be accessed via a URL.

• Dropbox

Online file sharing service

There are several websites that act as a mail proxy and allow you to transfer files via a browser. You specify the recipient, file name and your address.

• YouSendIt
• SendThisFile